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关键字：主叫识别 BEL202协议 FSK MT88E39 单片机 巡检
Abstract: The paper mainly descriped the design of eight channel hardware FSK Caller IDcircuit based on single chip microprocessor 。It simultaneously include BEL202 protocole，FSK and computer the parallel communication by dual port RAM technology,and so on.
这个过程可用微处理器（如TI 公司的MSP430）及其程序来实现，也可由专门的芯片来完成（本文既是），而后者对设计者来说则显得很简单。
图1. 8路FSK主叫号码接收电路(点击放大)
3.1硬件电路
图2a. 主程序流程图(点击放大)
4.2程序流程
[1]《Applicaion Report SPRA462--Inplementing Caller ID on Fixed-point DSPS》(（USA）Texas
Instruments Company/网址http://www.ti.com/)
[2]《Caller ID on TMS320C2xx》(（USA）Texas Instruments Company)
[3]《FSK Modulation and Demodulation With the Msp430 Microcontroller》(（USA）Texas
Instruments Company)
[4]《CMOS MT88E39 Calling Number Identifcation Circuit Advance information (CNIC1.1)》（（USA）Mitel
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