Texas Instruments TCM8002
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. 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.DESCRIPTION
CLKOUT/PO4(1) 2 O Clock output / programmable output #4, bit 1. A 2.56-MHz clock signal is output on this terminal or the device can be set so that it is bit 1 of PO4. CS 33 I Chip select (active low). This is the chip select input from the microcontroller. DATAIN 35 I Data input. Serial data from the microcontroller is input on this terminal. DATAOUT 34 O Data output. This is the serial data output to the microcontroller (3-state). DCLK 36 I Data clock. This is the serial microcontroller interface clock input. HCLK/PO4(3) 4 O TCM8010 interface cl