Parallax Serial LCD 规格书

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Parallax Serial LCD

2 rows x 16 characters, Non-backlit, with Piezospeaker (#27976)

2 rows x 16 characters, Backlit, with Piezospeaker (#27977)

4 rows x 20 characters, Backlit, with Piezospeaker (#27979)

The Parallax Serial LCDs are very functional, low-cost liquid crystal displays that can be easily interfaced

to and controlled by a microcontroller using a I/O pin. The LCD displays provide basic text wrapping so

that your text looks correct on the display. Full control over all of their advanced LCD features allows you

to move the cursor anywhere on the display with a single instruction and turn the display on and off in

any configuration. They support visible ASCII characters Dec 32-127, and in addition you may define up

to eight of your own custom characters to display anywhere on the LCD.

NOTE: If your Serial LCD Display does not have a speaker on the back, use the specifications

and information in the Product Change Notice: Revision E and Earlier section on page 11.

Features

 Clear 40-pixel characters (8 H x 5 W)

 Supports ASCII DEC characters 32-127

 Define up to eight custom characters

 Automatic text wrapping

 Single command cursor placement

 Single command clears the display

 Define up to eight custom characters

 Select 2400, 9600, or 19,200 baud with switches on

the back of the device

 Display type: STN, YG, positive transflective LCD

 Adjustable contrast knob on the back of the device

 YG LED for backlit model displays

Key Specifications

 Power requirements:

o Non-backlit: +5 VDC, 20 mA

o Backlit: +5 VDC, 20 mA (light off), ~ 80 mA typical (light on)

 Communication: Selectable asynchronous serial baud rates: 2400, 9600, 19200

 Operating temperature: -4 to +158 °F (-20 to +70°C)

 Dimensions: NOTE - Board and LCD size and style may vary

o 2x16: Approx. 1.42 x 3.15 in (36 x 80 mm)

o 4x20: Approx. 2.37 x 3.86 in (60.2 x 98.1 mm)

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Quick-Start Circuit

The Serial LCDs should be powered from an external regulated 5 V power supply. Make sure the power

supply has an adequate current rating to power the Serial LCD and the BASIC Stamp, Propeller chip, or

whichever microcontroller and other devices you are using.

CAUTION

DO NOT PROVIDE A SIGNAL TO THE 'RX' PIN BEFORE APPLYING 5 VDC TO THE '5V' PIN.

Baud Rate Setup

After connecting the Serial LCD, you will need to select the baud rate at which you are going to send it

data. You have three choices: 2400, 9600, and 19,200 baud. To set the baud rate, move the dip switches

on the back of the LCD into the correct positions according to the table next to the switches, which is also

repeated below:

MODE SW1 SW2

Test OFF OFF

2,400 ON OFF

9,600 OFF ON

19,200 ON ON

As you can see from the table, there is also a fourth choice called Test. Use this Test mode to confirm

that the power and ground to the LCD are hooked up correctly before you send it any data. Move the dip

switches to the Test setting and turn on the power. The LCD display should turn on with the backlight on

(models 27977, 27979) and display the following text:

Parallax, Inc.

www.parallax.com

If you don’t see the text at first, try adjusting the LCD contrast by turning the pot labeled “Increase

Contrast” with a screwdriver. Turn it in the direction of the arrow to make the characters show up more

clearly. If you still don’t see the characters, go back and check your electrical connections and try again.

Once you’ve successfully completed test mode, move the dip switches to the correct positions to select

the baud rate you want to use for your application.

Displaying Text

Now that the LCD is set up, it’s time to start sending text to the display. To display a character of text on

the Serial LCD, simply send the ASCII code of that character to the Serial LCD over the serial port at the

correct baud rate.

When a character is received, the Serial LCD displays that character at the current cursor position and

then moves the cursor one position to the right. When you first turn on the LCD, the cursor is in the

leftmost position on the top line, as you might expect. The short bar on the bottom of the character

shows where the cursor is positioned currently.

Once you’ve sent a full line characters to the LCD, you will notice that the cursor automatically wraps

around to the leftmost position of the second line, just like the text in a book. The text will wrap like this

at the end of every line, with the end of the bottom line wrapping back around to the top line of the LCD.

The text will never “run off” the display; you’ll always see all of the characters you send.

Example code is provided below. You may download the example code files from the 27976, 27977, or

27979 product pages at www.parallax.com; just enter any of these product numbers in the “search” field

on the home page

BASIC Stamp® 2 Example Code

You may download the example code from the 27976, 27977, or 27979 product pages at

www.parallax.com; just enter any of these product numbers in the “search” field on the home page. Try

the following code on your BASIC Stamp 2 to send a text string to the LCD display. First, set the baud

rate on your Serial LCD to 19,200. Then, load the code below into your BASIC Stamp 2 and run it.

You will see the text string show up and wrap to the second line of the display.

In all of your Serial LCD code, you should pause for 100 ms at start-up to give time for the Serial LCD to

initialize. You should also set the serial port pin on the BASIC Stamp to HIGH before the 100 ms start-up

delay, as this is the normal state of a serial port when it isn’t sending any data.

' {$STAMP BS2}

' {$PBASIC 2.5}

TxPin CON 0

Baud19200 CON 32

HIGH TxPin ' Set pin high to be a serial port

PAUSE 100 ' Pause for Serial LCD to initialize

SEROUT TxPin, Baud19200, ["Hello, this text will wrap."]

Propeller P8X32A Example Code

Try the following code on your Propeller to send a text string to the LCD display. First, set the baud rate

on your Serial LCD to 19,200. Then, load the code below into your Propeller and load RAM or EEPROM.

You will see the text string show up and wrap to the second line of the display.

In all of your Serial LCD code, you should wait for 100 ms after starting the FullDuplexSerial.spin object,

to give the object and the Serial LCD time to initialize. The FullDuplexSerial.spin object is included with

the Propeller Tool.

SerialiLEDilJemo‘ spin ixlnfr‘eq = Siﬂﬂﬂiﬂﬂﬂ TXJIN = ﬂ UBJ LCD.start(TX7PIN. TXJIN, Zlﬂﬂﬂ. 1972M)

{{

Serial_LCD_Demo.spin

For Parallax Serial LCDs 27976, 27977, 27979

}}

CON

_clkmode = xtal1 + pll16x

_xinfreq = 5_000_000

TX_PIN = 0

BAUD = 19_200

OBJ

LCD : "FullDuplexSerial.spin"

PUB Main

LCD.start(TX_PIN, TX_PIN, %1000, 19_200)

waitcnt(clkfreq / 100 + cnt) ' Pause for FullDuplexSerial.spin to initialize

LCD.str(string("Hello, this text will wrap."))

Moving the Cursor

When you send a character to the Serial LCD, it always displays at the current cursor position. There are

a few different ways to move the cursor on the Serial LCD display. After each character you send, the

cursor automatically moves over one position. Along with this, there is a standard set of cursor move

commands including Backspace, Carriage Return, and Line Feed.

The Backspace/Left command (Dec 8) moves the cursor one place to the left and the Right command

(Dec 9) moves the cursor one place to the right. These can be useful for moving the cursor around to

overwrite existing text. These commands wrap to the next line of the display, if necessary. The Line Feed

command (Dec 10) moves the cursor to the next line of the display without changing the horizontal

position of the cursor. The Carriage Return command (Dec 13) also moves the cursor to the next line, but

it moves the cursor to the leftmost position on that line as well. The Form Feed command (Dec 12) clears

the entire display and moves the cursor to the leftmost position on line 0, just like when you first turn on

the display. You will need to pause for 5mS in your code after sending the Form Feed command, to give

the Serial LCD time to clear the display. Except for Form Feed, none of these move commands affects the

characters on the display.

There are also direct move commands that you can use to move the cursor to any position on the display

with a single command. The commands in the range Dec 128 to 143 and Dec 148 to 163 move the cursor

to the 16 different positions on each of the two lines of the model 27976 and 27977 LCDs. The

commands in the range Dec 128 to 207 move the cursor to the 20 different positions on each of the four

lines of the model 27979 LCD.

Controlling the Display

You also have control over the various display modes of the Serial LCD. The display-off command (Dec

21) turns off the display so that all of the characters disappear. The characters aren’t erased from the

display, though, and you can even keep writing new characters to the display when it is turned off. A

trick to make a lot of text show up all at once, even at a slow baud rate, is to turn off the display and

then send all of your text. Then, when you turn the display on again, all of the text appears instantly.

The display-on commands (Dec 22 to 25) turn the display back on and also control whether you want to

display the cursor and/or make the cursor character blink. The cursor is the short bar that shows up

below the character at the current cursor position. The blink option makes that character blink on and off

repeatedly. You can turn the cursor and blink options on or off, in any combination, as listed in the

command set table. You can change the cursor and blink mode even if the display is already on; you

don’t need to turn it off and then back on again.

With models 27977 and 27979, you can also control the backlight of the display. The backlight lights up

the display so that it is easier to see in the dark. There are commands to turn the backlight on (Dec 17)

and off (Dec 18).

Custom Characters

The Serial LCD has the capability to store up to eight user-defined custom characters. The custom

characters are stored in RAM and so they need to be redefined if you turn off the power. You can display

the custom characters by sending the commands Dec 0 to 7, as shown in the command set table. The

custom character will display at the current cursor position.

The custom characters are five pixels wide by eight pixels high. Each of the characters is stored as a

series of eight data bytes where the low five bits of each byte represent a row of pixels in the character.

The high three bits of each byte are ignored. A bit value of one turns that pixel on (i.e. makes it black).

The bottom row of pixels is often left blank (all zeros) to make it easier to see the cursor.

To define a custom character, you will send a total of 9 bytes to the Serial LCD. The first byte needs to

be a valid define-custom-character command (Dec 248 to 255) and must be followed by eight data bytes

that define the pixels of the character. The Serial LCD will always use the next eight bytes it receives to

set the pixels of the character. The data bytes define the character starting at the topmost row of pixels,

as shown in the example code.

BASIC Stamp 2 Custom Character Example

Define a custom character using the code example below. First, set the baud rate on your Serial LCD to

19,200. Then, load the code below into your BASIC Stamp 2 and run it. You will see a diamond character

appear on the screen.

' {$STAMP BS2}

' {$PBASIC 2.5}

TxPin CON 0

Baud19200 CON 32

HIGH TxPin ' Set pin high to be a serial port

PAUSE 100 ' Pause for Serial LCD to initialize

SEROUT TxPin, Baud19200, [250] ' Define custom character 2

' Now send the eight data bytes

SEROUT TxPin, Baud19200, [%00000] ' %00000 =

SEROUT TxPin, Baud19200, [%00100] ' %00100 = *

SEROUT TxPin, Baud19200, [%01110] ' %01110 = * * *

SEROUT TxPin, Baud19200, [%11111] ' %11111 = * * * * *

SEROUT TxPin, Baud19200, [%01110] ' %01110 = * * *

SEROUT TxPin, Baud19200, [%00100] ' %00100 = *

SEROUT TxPin, Baud19200, [%00000] ' %00000 =

SEROUT TxPin, Baud19200, [2] ' Display the new custom character 2

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Propeller™ P8X32A Example Code

Define a custom character using the code example below. First, set the baud rate on your Serial LCD to

19,200. Then, load the code below into your Propeller and load RAM or EEPROM. You will see a diamond

character appear on the screen. Note: the FullDuplexSerial.spin object is included with the Propeller Tool

software.

{{

Serial_LCD_Custom_Character.spin

For Parallax Serial LCDs 27976, 27977, 27979

}}

CON

_clkmode = xtal1 + pll16x

_xinfreq = 5_000_000

TX_PIN = 0

BAUD = 19_200

OBJ

LCD : "FullDuplexSerial.spin"

PUB Main

LCD.start(TX_PIN, TX_PIN, %1000, 19_200)

waitcnt(clkfreq / 100 + cnt) ' Pause for FullDuplexSerial.spin to initialize

LCD.tx(250) ' Define custom character 2

' Now send the eight data bytes

LCD.tx(%00000) ' %00000 =

LCD.tx(%00100) ' %00100 = *

LCD.tx(%01110) ' %01110 = * * *

LCD.tx(%11111) ' %11111 = * * * * *

LCD.tx(%01110) ' %01110 = * * *

LCD.tx(%00100) ' %00100 = *

LCD.tx(%00000) ' %00000 =

LCD.tx(2) ' Display the new custom character 2

Playing Music

The Serial LCD has a built-in piezoelectric speaker which can play musical notes. The LCD includes a

sophisticated music player enabling users to program songs and tunes. You can play musical notes by

sending three types of note commands (Dec 214 to 232), as shown in the command set table.

Set Length

The “set length” commands (Dec 208 to 214) determines the length of time each note will play for. This

value remains the same until another “set length” command is received. A note’s length can range from

a 1/64th note to a whole note. A whole note is 2 seconds long.

Backspace / Left , The cursor is moved one position to the left The Right , The cursor is moved one position to the right The command doesn't erase the character Line Feed , The cursor is moved down one line. For the two i LCD model, if on line 0 it goes to line 1. If on line 1, it wraps around to line 0. The horizontal position remains the same. Form Feed , entire displa commandi Carriage Return , For is moved to position position 0 on line 0‘

Set Scale

The “set scale” commands (Dec 215 to 219) determines the octave each note will play in. This value

remains the same until another “set scale” command is received. The current octave can be set to a

value between 3 and 7, and each octave consists of 12 notes. The frequency for each note and scale

combination is shown in the table below.

Scale A A# B C C# D D# E F F# G G#

3 220 233 247 262 277 294 311 330 349 370 392 415

4 440 466 494 523 554 587 622 659 698 740 784 831

5 880 932 988 1047 1109 1175 1245 1319 1397 1480 1568 1661

6 1760 1865 1976 2093 2217 2349 2489 2637 2794 2960 3136 3322

7 3520 3729 3951 4186 4435 4699 4978 5274 5588 5920 6272 6645

Play Note

The “play note” commands (Dec 220 to 232) play a single note for the currently set time and in the

currently set octave.

Command Set

The tables on the following pages list all of the valid Serial LCD commands. Commands marked as N/A

are invalid and are ignored. The lines of the LCD display are numbered starting from 0, with line 0 being

the top line. The character positions on each line are numbered starting from 0, with position 0 being the

leftmost position on the line.

Dec Hex Action

0 00 Display custom character 0

1 01 Display custom character 1

2 02 Display custom character 2

3 03 Display custom character 3

4 04 Display custom character 4

5 05 Display custom character 5

6 06 Display custom character 6

7 07 Display custom character 7

8 08

Backspace / Left - The cursor is moved one position to the left. The

command doesn’t erase the character.

9 09

Right - The cursor is moved one position to the right. The

command doesn’t erase the character.

10 0A Line Feed - The cursor is moved down one line. For the two line

LCD model, if on line 0 it goes to line 1. If on line 1, it wraps

around to line 0. The horizontal position remains the same.

Dec Hex Action

11 0B N/A

12 0C Form Feed - The cursor is moved to position 0 on line 0 and the

entire display is cleared. Users must pause 5mS after this

command.

13 0D

Carriage Return – For the two line LCD model, if on line 0 the cursor

is moved to position 0 on line 1. If on line 1, it wraps around to

position 0 on line 0.

14 - 16 0E - 10 N/A

17 11 Turn backlight on (only on models 27977, 27979)

Dec Hex Action

18 12 Turn backlight off (Default)

19 - 20 13 - 14 N/A

21 15 Turn the display off

22 16 Turn the display on, with cursor off and no blink

23 17 Turn the display on, with cursor off and character blink

24 18 Turn the display on, with cursor on and no blink (Default)

25 19 Turn the display on, with cursor on and character blink

26 - 31 1A - 1F N/A

32 - 127 20 - 7F Display ASCII characters. See the ASCII character set table.

128 80 Move cursor to line 0, position 0

129 81 Move cursor to line 0, position 1

130 82 Move cursor to line 0, position 2

131 83 Move cursor to line 0, position 3

132 84 Move cursor to line 0, position 4

133 85 Move cursor to line 0, position 5

134 86 Move cursor to line 0, position 6

135 87 Move cursor to line 0, position 7

136 88 Move cursor to line 0, position 8

137 89 Move cursor to line 0, position 9

138 8A Move cursor to line 0, position 10

139 8B Move cursor to line 0, position 11

140 8C Move cursor to line 0, position 12

141 8D Move cursor to line 0, position 13

142 8E Move cursor to line 0, position 14

143 8F Move cursor to line 0, position 15

144 90 Move cursor to line 0, position 16 (only on model 27979)

145 91 Move cursor to line 0, position 17 (only on model 27979)

146 92 Move cursor to line 0, position 18 (only on model 27979)

147 93 Move cursor to line 0, position 19 (only on model 27979)

148 94 Move cursor to line 1, position 0

149 95 Move cursor to line 1, position 1

150 96 Move cursor to line 1, position 2

151 97 Move cursor to line 1, position 3

152 98 Move cursor to line 1, position 4

153 99 Move cursor to line 1, position 5

154 9A Move cursor to line 1, position 6

155 9B Move cursor to line 1, position 7

156 9C Move cursor to line 1, position 8

Dec Hex Action

157 9D Move cursor to line 1, position 9

158 9E Move cursor to line 1, position 10

159 9F Move cursor to line 1, position 11

160 A0 Move cursor to line 1, position 12

161 A1 Move cursor to line 1, position 13

162 A2 Move cursor to line 1, position 14

163 A3 Move cursor to line 1, position 15

Dec Hex Action

164 A4 Move cursor to line 1, position 16 (only on model 27979)

165 A5 Move cursor to line 1, position 17 (only on model 27979)

166 A6 Move cursor to line 1, position 18 (only on model 27979)

167 A7 Move cursor to line 1, position 19 (only on model 27979)

168 A8 Move cursor to line 2, position 0 (only on model 27979)

169 A9 Move cursor to line 2, position 1 (only on model 27979)

170 AA Move cursor to line 2, position 2 (only on model 27979)

171 AB Move cursor to line 2, position 3 (only on model 27979)

172 AC Move cursor to line 2, position 4 (only on model 27979)

173 AD Move cursor to line 2, position 5 (only on model 27979)

174 AE Move cursor to line 2, position 6 (only on model 27979)

175 AF Move cursor to line 2, position 7 (only on model 27979)

176 B0 Move cursor to line 2, position 8 (only on model 27979)

177 B1 Move cursor to line 2, position 9 (only on model 27979)

178 B2 Move cursor to line 2, position 10 (only on model 27979)

179 B3 Move cursor to line 2, position 11 (only on model 27979)

180 B4 Move cursor to line 2, position 12 (only on model 27979)

181 B5 Move cursor to line 2, position 13 (only on model 27979)

182 B6 Move cursor to line 2, position 14 (only on model 27979)

183 B7 Move cursor to line 2, position 15 (only on model 27979)

184 B8 Move cursor to line 2, position 16 (only on model 27979)

185 B9 Move cursor to line 2, position 17 (only on model 27979)

186 BA Move cursor to line 2, position 18 (only on model 27979)

187 BB Move cursor to line 2, position 19 (only on model 27979)

188 BC Move cursor to line 3, position 0 (only on model 27979)

189 BD Move cursor to line 3, position 1 (only on model 27979)

190 BE Move cursor to line 3, position 2 (only on model 27979)

191 BF Move cursor to line 3, position 3 (only on model 27979)

192 C0 Move cursor to line 3, position 4 (only on model 27979)

193 C1 Move cursor to line 3, position 5 (only on model 27979)

194 C2 Move cursor to line 3, position 6 (only on model 27979)

195 C3 Move cursor to line 3, position 7 (only on model 27979)

196 C4 Move cursor to line 3, position 8 (only on model 27979)

197 C5 Move cursor to line 3, position 9 (only on model 27979)

198 C6 Move cursor to line 3, position 10 (only on model 27979)

199 C7 Move cursor to line 3, position 11 (only on model 27979)

200 C8 Move cursor to line 3, position 12 (only on model 27979)

201 C9 Move cursor to line 3, position 13 (only on model 27979)

202 CA Move cursor to line 3, position 14 (only on model 27979)

Dec Hex Action

203 CB Move cursor to line 3, position 15 (only on model 27979)

204 CC Move cursor to line 3, position 16 (only on model 27979)

205 CD Move cursor to line 3, position 17 (only on model 27979)

206 CE Move cursor to line 3, position 18 (only on model 27979)

207 CF Move cursor to line 3, position 19 (only on model 27979)

208 D0 Set note length to 1/64 note

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Dec Hex Action

209 D1 Set note length to 1/32 note

210 D2 Set note length to 1/16 note

211 D3 Set note length to 1/8 note

212 D4 Set note length to 1/4 note

213 D5 Set note length to 1/2 note

214 D6 Set note length to whole note (2 seconds)

215 D7 Select the 3rd scale (A = 220 Hz)

216 D8 Select the 4th scale (A = 440 Hz)

217 D9 Select the 5th scale (A = 880 Hz)

218 DA Select the 6th scale (A = 1760 Hz)

219 DB Select the 7th scale (A = 3520 Hz)

220 DC Play A note

221 DD Play A# note

222 DE Play B

223 DF Play C

224 E0 Play C#

225 E1 Play D

226 E2 Play D#

227 E3 Play E

228 E4 Play F

229 E5 Play F#

230 E6 Play G

231 E7 Play G#

232 E8 Pause for current note length (no sound)

233 - 247 E9 – F7 N/A

248 F8 Define custom character 0. This command must be followed by

eight data bytes.

249 F9 Define custom character 1. This command must be followed by

eight data bytes.

250 FA Define custom character 2. This command must be followed by

eight data bytes.

251 FB Define custom character 3. This command must be followed by

eight data bytes.

252 FC Define custom character 4. This command must be followed by

eight data bytes.

253 FD Define custom character 5. This command must be followed by

eight data bytes.

254 FE Define custom character 6. This command must be followed by

eight data bytes.

255 FF Define custom character 7. This command must be followed by

eight data bytes.

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Product Change Notice: Revision E and Earlier

If your Serial LCD Display does not have a piezospeaker on the back and looks similar to the image

above, please use the following information and specifications when using this product. All connections,

test code and commands remain the same, except for commands controlling the piezospeaker.

Key Specifications

 Power requirements:

o Non-backlit: +5 VDC, 20 mA

o Backlit: +5 VDC, 20 mA (light off), 80 mA (light on)

 Communication: Selectable asynchronous serial baud rates: 2400, 9600, 19200

 Operating temperature: -4 to +158 °F (-20 to +70°C)

 Dimensions: Board and LCD size and style may vary

o 2x16: Approx. 1.5 x 3.15 in (38 x 80 mm)

o 4x20: Approx. 2.4 x 3.9 in (60 x 100 mm)

REV E CAUTION: DO NOT PROVIDE A SIGNAL TO THE ‘RX’ PIN BEFORE APPLYING 5 VDC TO THE ‘5V’

PIN.

Revision History

Version 3.1: corrected current draw specification on Page 1 from 50 mA to 80 mA.

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