Abstract : Currently, many motor speed control systems are designed using a PLC + frequency converter scheme, which is convenient but obviously expensive. This system uses an MSP430 + CPLD + DIP/IPM scheme to control the speed of an AC motor. In practical applications, it can completely replace conventional designs, meet control requirements, and significantly reduce costs while being easier to design. Keywords : MSP430; CPLD; DIP/IPM 1. Introduction to MSP430F148 The MSP430 series microcontrollers are 16-bit microcontrollers developed by TI. Their outstanding feature is ultra-low power consumption, making them ideal for various low-power applications. There are multiple series and models, each composed of basic functional modules combined according to different application goals. Typical applications include flow meters, smart meters, medical equipment, and security systems. Due to its high performance-price ratio, its application is becoming increasingly widespread. The MSP430F148 is one of the recently launched MSP430F14x/13x series microcontrollers from TI. Compared to other chips in the MSP430 series, the main features are as follows: (1) Ultra-low power consumption: Due to the built-in high-speed flash memory with extremely low power consumption, the MSP430F14x13x series consumes less power in standby mode than the natural loss of the battery when it is not in use. Under normal working conditions, if the working voltage is 2.2V, its typical current consumption is only 250uAfMIPS, while the working current in standby mode drops to less than 1uA. (2) Fast execution speed: The working voltage range of the MSP430F13 14x series is 1.8-3.6V, and the performance can reach 8MIPS. (3) Large storage capacity: The MSP430F148 has 48 KB Flash ROM and 2 KB RAM built-in. The RAM space is the largest in the MSP430 series, which basically meets the needs of running RTOS. [b][align=center]For details, please click: Research on Motor Speed ​​Control System Based on MSP430[/align][/b]