TMS370 datasheet(25/60 Pages) TI

25 / 60 page

TMS370Cx2x

8-BIT MICROCONTROLLER

SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

programmable timer 1 (continued)

The TMS370Cx2x device includes a 24-bit WD timer, contained in the T1 module, which can be programmed

as an event counter, pulse accumulator, or interval timer if the watchdog function is not used. The WD monitors

software and hardware operation, and implements a system reset when the WD counter is not serviced properly

(WD counter overflow or WD counter is re-initialized by an incorrect value). The WD can be configured as one

of the three mask options as follows: standard watchdog, hard WD, or simple counter.

D Standard watchdog configuration (see Figure 8) for ’C722 EPROM and mask-ROM devices:

–

Watchdog mode

–

Ten different WD overflow rates ranging from 6.55 ms to 3.35 s at 5-MHz SYSCLK

–

A WD reset key (WDRST) register clears the watchdog counter (WDCNTR) when a correct value is

written.

–

Generates a system reset if an incorrect value is written to the watchdog reset key or if the counter

overflows

–

A watchdog overflow flag (WD OVRFL INT FLAG) bit indicates whether the WD timer initiated a

system reset.

–

Non-watchdog mode

–

Watchdog timer can be configured as an event counter, pulse accumulator or an interval timer.

16-Bit

Watchdog Counter

Reset

Prescaler

Clock

Watchdog Reset Key

WD OVRFL

TAP SEL

WD OVRFL

RST ENA

System Reset

T1CTL1.7

WDRST.7-0

WDCNTR.15-0

T1CTL2.7

T1CTL2.5

WD OVRFL

INT ENA

Interrupt

T1CTL2.6

WD OVRFL

INT FLAG

Figure 8. Standard Watchdog

TMS370 Datasheet(PDF) 25 Page - Texas Instruments

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