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.
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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