communication between 8051 and DTMF IC HT9200A
File list:
8051_DTMF
........\bao dong dien thoai_ok.DSN
........\DTMF_S_LIB.asm
........\Last Loaded sim.DBK
........\Main_ASM.asm
........\Main_ASM.hex
........\Main_ASM.lst
........\Main_ASM.SDI
........\Main_Code.lst
........\Main_Code.SDI
........\MT8880_LIB.asm
........\sim.DSN
........\sim.PWI
........\TV_DELAY.asm