TMS370 datasheet(24/63 Pages) TI

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TMS370CxCx

8-BIT MICROCONTROLLER

SPNS040B – NOVEMBER 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 2 module

The TMS370CxCx devices include a serial communications interface 2 (SCI2) module. The SCI2 module

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

the standard non-return-zero (NRZ) format. The SCI2 modules 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 SCI2 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 SCI2 module include:

D Two external pins:

–

SCITXD: SCI2 module transmit-output pin or general-purpose bidirectional I/O pin.

–

SCIRXD: SCI2 module receive-input pin or general-purpose bidirectional I/O pin.

D Asynchronous communications mode

D Baud rate: 64K different programmable rates

–

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

Asynchronous Baud

SYSCLK

(BAUD REG

) 1)

D Data word format:

–

One start bit

–

Data word length programmable from one to eight bits

–

Optional even / odd / no parity bit

–

One or two stop bits

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