TMS370 datasheet(36/73 Pages) TI

36 / 73 page

TMS370Cx6x

8-BIT MICROCONTROLLER

SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

serial peripheral interface (SPI) module

The SPI is a high-speed, synchronous, serial I/O port that allows a serial bit stream of programmed length

(1 to 8 bits) to be shifted into and out of the device at a programmable bit-transfer rate.The SPI is used normally

for communications between the microcontroller and external peripherals or another microcontroller. Typical

applications include external I/O or peripheral expansion using devices such as shift registers, display drivers,

and analog-to-digital (A/D) converters. The master/slave operation of the SPI supports multi-device

communications. The SPI module features include the following:

D Three external pins:

–

SPISOMI: SPI slave output/master input pin or general-purpose bidirectional I/O pin

–

SPISIMO: SPI slave input/master output pin or general-purpose bidirectional I/O pin

–

SPICLK: SPI serial-clock pin or general-purpose bidirectional I/O pin

D Two operational modes: master and slave

D Baud rate: Eight different programmable rates

–

Maximum baud rate in master mode: 2.5M bps at 5-MHz SYSCLK

SPI BAUD RATE

+ SYSCLK

where b = bit rate in SPICCR.5-3 (range 0–7)

–

Maximum baud rate in slave mode: 625K bps at 5-MHz SYSCLK

For maximum slave SPI BAUD RATE < SYSCLK/8

D Data-word format: one to eight data bits

D Simultaneous receiver and transmitter operation (transmit function can be disabled in software)

D Transmitter and receiver operations are accomplished through either interrupt-driven or polled algorithms.

D Seven SPI module-control registers: located in control register frame beginning at address P030h

TMS370 Datasheet(PDF) 36 Page - Texas Instruments