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The Flash-programmable 16-MHz MSP430AFE253 device developed by Texas Instruments is a highly flexible and powerful single-chip mixed-signal measurement device targeting electricity meter and sub-meter applications. In such applications, high reliability and accuracy of better than 0.1% is often required. This applicaton report demonstrates robust real-time embedded software running on the MSP430AFE253 device and the test cases it has passed. This firmware is developed to meet the China State Grid (CSG) specification for single-phase electricity meters. The software covers the use of the on-chip analog front end to measure electricity as well as other related metering parameters.