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關鍵字：主叫識別 BEL202協(xié)議 FSK MT88E39 單片機 巡檢
Abstract: The paper mainly descriped the design of eight channel hardware FSK Caller IDcircuit based on single chip microprocessor 。It simultaneously include BEL202 protocole，F(xiàn)SK and computer the parallel communication by dual port RAM technology,and so on.
這個過程可用微處理器（如TI 公司的MSP430）及其程序來實現(xiàn)，也可由專門的芯片來完成（本文既是），而后者對設計者來說則顯得很簡單。
圖1. 8路FSK主叫號碼接收電路(點擊放大)
3.1硬件電路
圖2a. 主程序流程圖(點擊放大)
4.2程序流程
[1]《Applicaion Report SPRA462--Inplementing Caller ID on Fixed-point DSPS》(（USA）Texas
Instruments Company/網(wǎng)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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