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In summary, the MSP430 is a low power, high performance, 16-bit microcontroller, capable of 0.1 µA during power down and 0.8 µA in standby mode. The MSP430 can have a clock rate of up to 25 MHz and clock start-up is less than 6 µs. It supports Flash memory of up to 256 kB, and up to 16 kB of RAM. Many MSP430s feature an integrated LCD driver capable of displaying up to three hundred and twenty segments. There is a powerful analog front-end and good analog integration to complete a System-on-Chip solution. Many low power peripherals are available that boost performance as needed. Also, the MSP430 has multiple communication peripherals to support different communication protocols, integrated real-time clock with temperature compensation, and an embedded emulation for debug. For utility metering applications there are more specific features required for the MCU. In the MSP430 a powerful A/D converter is provided, operating in the 24-bit mode. It has a programmable gain amplifier for all types of sensors, and it is capable of supporting differential inputs. The MSP430 offers simultaneous sampling of voltage and current, enabling an accurate measurement of the energy. The MSP430 low power features are important in utility metering. Because the power in the active mode is low the power supply is less expensive, reducing the overall cost. Also, the low power requirement increases the battery life, which is important in gas and water meters. There are multiple communication peripherals including UARTs, SPIs, I²C, and other supported protocols. The MSP430 also has a PLC interface and offers up to seven individual Sigma/Delta converters.
