本文以介绍MSP430单片机和ISD4004语音芯片为基础，结合键盘控制器74c922和MSP430的外围设备设计了一台多功能电话留言系统。

This paper introduces MSP430 Ultra-Low Power Microcontroller and the ISD4004 chip. A multi-function telephone record system was designed with the two chips and 74c922 keypad encoder IC.

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最早的设计理念是通过将大量外围设备和CPU 集成在一个芯片中，使计算机系统更小，更容易集成进复杂的而对体积要求严格的控制设备当中。

The first design is by a large number of peripherals and CPU on a chip in the computer system, smaller, more easily integrated into a complex and demanding on the volume control device which.

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