基于单片机的双音多频实验模块的设计

his paper introduces the experimental module's compositions and principles of DTMF based on MCU and the realization of the system hardware and software, and states the experimental phenomena of the DTMF experiment in details. DTMF as the core, this module covers the programme-controlled exchange functions such as user modules and user signaling, and realizes the operation of the whole experimental module by the programs and the correspongding functions of the circuit.