In view of the valve opening control requirement of the pneumatic regulating valve in industrial process control field,an MSP430 SCM based intelligent valve position opening control system with SPI drive display is studied. The hardware system is composed of MSP430 drive circuit,sampling circuit,back-end PWM drive,and peripheral functional chip. In the software system,the modular design idea is adopted and the CPU enters low power consumption mode by means of interruption to reduce power consumption of the ...