TMS370 datasheet(25/50 Pages) TI

25 / 50 page

TMS370Cx1x

8-BIT MICROCONTROLLER

SPNS012F – MAY 1987 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

programmable timer 1 (continued)

D Simple counter configuration (see Figure 10) for mask-ROM devices only

–

Simple counter can be configured as an event counter, pulse accumulator, or an internal timer.

16-Bit

Watchdog Counter

Reset

Prescaler

Clock

Watchdog Reset Key

WD OVRFL

TAP SEL

T1CTL1.7

WDRST.7-0

WDCNTR.15-0

T1CTL2.5

WD OVFL

INT FLAG

WD OVRFL

INT ENA

Interrupt

T1CTL2.6

Figure 10. Simple Counter

serial peripheral interface

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

to eight bits) to be shifted into and out of the device at a programmable bit transfer rate. The SPI normally is

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

Typical applications include external I/O or peripheral expansion by way of devices such as shift registers,

display drivers, and A/D converters. Multi-device communications are supported by the master/slave operation

of the SPI. 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 operations (transmit function can be disabled in software)

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