超声测距电路，有MSP4301232和MSP430F135，对使用MSP430的开发人员有参考-Ultrasonic Ranging circuit, there are MSP4301232 and MSP430F135, on the use of MSP430 developer reference

Msp430单片机基础与实践光盤的所有内容有例程，电路图。方便大家参考-Msp430 single-chip CD-ROM and practice based on the content of all routines, circuit diagrams. Convenient reference

本文件为msp430f5438的最小系统电路原理示意图，可供初学者进行参考(This document is the schematic diagram of the minimum system circuit of MSP430F5438, which can be used for reference by beginners)