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The booting process in the LPC1700 is similar to the LPC2000 family. The chip offers two ways to program the flash. The first way is In-System programming (ISP) which entails programming or reprogramming the on-chip flash memory using the boot loader software and UART0 serial port. This can be done when the part resides in the end-user board. The second way is In-Application Programming (IAP) which is the process of performing erase and write operations in the on-chip flash memory as directed by the end-user application code. If the flowchart is followed, it is possible to have two outcomes. If valid user code is present in the Flash, the bootloader will transfer code execution to internal memory. If no valid code exists, pin P2.10 is held low, the ISP mode is invoked, and the chip will look for ISP commands on the UART interface. Finally, the bootloader also provides Code Read Protection (CRP) that enables the application to apply different levels of security.
PTM Published on: 2011-11-02
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