DTMF编码芯片HT9200的51接口程序。输入参数R2表示发送数据个数，输入数据与发送数据与DTMF码的关系:00H-0 01H-1 02H-2 03H-3 04H-4 05H-5 06H-6 07H-7 08H-8 09H-9 0AH-A 0BH-B 0CH-C 0DH-D 0EH-* 0FH-#。详细说明参考文件内-DTMF encoder chip HT9200 51 interface program. R2 said input parameters to send data dis

3个完整的DTMF汇编程序，包括DTMF信号的产生和DTMF译码，译码采用Goertzel算法，5406上测试通过-3 programs of dtmf encoder and decoder,include goertzel algoritm

AT89C2051控制DTMF编码芯片进行DTMF编码。-AT89C2051 control DTMF encoder chip DTMF encoder.

用DSP编程，实现DTMF编码器的相关功能，已通过运行-With DSP programming, implementation DTMF encoder related functions, has been run by