TMS370 datasheet(25/49 Pages) TI

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TMS370Cx0x

8-BIT MICROCONTROLLER

SPNS029C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

programmable timer 1 (continued)

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 communications interface 1 (SCI1) module

The TMS370Cx0x devices include a serial communications interface 1 (SCI1) module. The SCI1 module

supports digital communications between the TMS370 devices and other asynchronous peripherals and uses

the standard non-return-zero format (NRZ) format. The SCI1’s receiver and transmitter are double buffered, and

each has its own separate enable and interrupt bits. Both can be operated independently or simultaneously in

the full duplex mode. To ensure data integrity, the SCI1 checks received data for break detection, parity, overrun,

and framing errors. The speed of bit rate (baud) is programmable to over 65,000 different speeds through a

16-bit baud-select register.

Features of the SCI1 module include:

D Three external pins:

–

SCITXD: SCI transmit-output pin or general-purpose bidirectional I/O pin

–

SCIRXD: SCI receive-input pin or general-purpose bidirectional I/O pin

–

SCICLK: SCI bidirectional serial-clock pin, or general-purpose bidirectional I/O pin

D Two communications modes: asynchronous and isosynchronous†

D Baud rate: 64K different programmable rates

–

Asynchronous mode: 3 bps to 156K bps at 5-MHz SYSCLK

ASYNCHRONOUS BAUD

SYSCLK

(BAUD REG

) 1)

–

Isosynchronous mode: 39 bps to 2.5M bps at 5-MHz SYSCLK

ISOSYNCHRONOUS BAUD

SYSCLK

(BAUD REG

) 1)

† Isosynchronous = Isochronous

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