TCM8002 Datasheet(数据表) 5 Page

5 page

TCM8002

DATA PROCESSOR FOR CELLULAR TELEPHONE

SLWS008C – SEPTEMBER 1994 – REVISED JUNE 1996

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

detailed description

Data communication between the mobile station and the land station in AMPS and TACS systems is achieved

over forward and reverse control channels when a call is not in progress, or in short bursts over the forward and

reverse voice channels when a call is in progress. The TCM8002 device has a receive path that recovers data

from the FOCC (forward control-channel) and FVC (forward voice-channel) formats. The transmit path encodes

and formats data for the RECC (reverse control channel) and RVC (reverse voice channel).

For voice-channel communications, the received SAT is detected and regenerated for transmission.

Communication with the microcontroller/microprocessor in the telephone is through a serial interface. The

TCM8002 also provides interrupts to alert the processor to the occurrence of specific events. The receiver is

made up of the Data Recovery, Majority Voting, BCH (Bose-Chaudhuri-Hocquenghem) Decoder, RX Buffer,

Arbitration Logic, and RX Control blocks. The SAT Detector/Regenerator is used during FVC reception and RVC

transmission.

The transmit path consists of the TX Buffer and TX Encoder blocks. A serial microprocessor interface and the

interrupt logic are also provided. Four ancillary functions are included:

• TCM8010 interface

• Watchdog Timer

• Counter/Timer

• twenty programmable digital bidirectional I/O lines (eight of the output terminals can be reconfigured as

processor output ports)

clock divider

The clock signal for the TCM8002 is supplied in two ways:

• A crystal can be connected to XTAL1 and XTAL2.

• A clock signal from another source can be connected to XTAL1.

When a crystal is used, a resistor (typical value 1 M

Ω) should be connected between XTAL1 and XTAL2 to

provide a bias for the oscillator. The crystal frequency must be 2.56 MHz, 5.12 MHz, 7.68 MHz, or 10.24 MHz.

If an external clock signal is connected, it must be at one of these crystal frequencies or one of two additional

frequencies: 15.36 MHz or 20.48 MHz.

The clock frequency defaults to 2.56 MHz when the TCM8002 is reset. The clock-divider circuit provides a

2.56-MHz clock for internal use and must be configured according to the selected crystal or external clock

frequency. Control word 2, bits 5 and 6, and control word 4, bit 1, are used to configure the clock divider. The

output from the clock-divider circuit is provided at CLKOUT and is always 2.56 MHz. This can be used to clock

the TCM8010 advanced audio processor.

The bit rate of the transmitted Manchester-encoded data, the signaling-tone frequency, and the accuracy of the

SAT measurement are all determined by the crystal or external clock. The AMPS and TACS system

requirements both specify a maximum transmitted bit frequency error of

±100 ppm; therefore, over the

operating temperature range of the phone, the crystal or clock frequency error must be no more than

±100 ppm.

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