TCM8002 pdf datasheet (DATA PR

The TCM8002 provides the data transceiving, data processing, and SAT (supervisory audio tone) functions for the AMPS (advanced mobile phone service) and TACS (total access communications system) cellular telephone standards. A highly integrated device, the TCM8002 includes a number of additional functions that are helpful in the implementation of the typical cellular telephone. These extra functions include a watchdog timer, which is normally external to the telephone microcontroller, and two 8-bit- and one 4-bit-wide
user-programmable general-purpose input/output ports. These can be used to provide port expansion for the microcontroller. An 8-bit counter/timer for user-defined purposes is also included.To facilitate the application of the TCM8002 and to minimize the number of connections, a single serial interface to the microcontroller is used for controlling, receiving, and transmitting data. There is also a dedicated interface,including a compatible clock signal, to the companion TCM8010 audio processor that performs most of the audio processing required in a cellular telephone. Additional outputs are also provided for interfacing to other
audio processors.The TCM8002 is built using a low-power CMOS process and operates with a 5-V or 3.3-V power supply. When used in conjunction with the TCM8010, a unique and very compact low-power solution for AMPS/TACS baseband processing in 5-V and 3-V systems is realized.