TMP93CS32F datasheet(144/180 Pages) TOSHIBA

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TMP93CS32

2004-02-10

93CS32-142

3.11 Watchdog Timer (Runaway Detecting Timer), Warm-up Timer

TMP93CS32 contains a watchdog timer of Runaway detecting.

The watchdog timer (WDT) is used to return the CPU to the normal state when it detects that

the CPU has started to malfunction (runaway) due to causes such as noise. When the watchdog

timer detects a malfunction, it generates a non-maskable interrupt INTWD to notify the CPU of

the malfunction.

Connecting the watchdog timer output to the reset pin internally forces a reset.

This watchdog timer consists of 7-stage and 15-stage binary counters.

These binary counters are also used as a warm-up timer for the internal oscillator

stabilization. This is used for releasing the STOP.

3.11.1

Configuration

Figure 3.11.1 shows the block diagram of the watchdog timer (WDT).

Figure 3.11.1 Block Diagram of Watchdog Timer/Warm-up Timer

÷2

÷16

÷8

÷4

÷2

fc/16

fc/8

fc/4

fc/2

SYSCR1<GEAR2:0>

CPU

7-stage

binary

counter

15-stage binary counter

Selector

WDMOD<WARM>

T45CR<QCU>

Interrupt

control

WDMOD

<WDTP1:0>

Q S

Reset

HALT instruction

(STOP, IDLE1 mode)

Reset

WDMOD<WDTE>

Write disable code

to WDCR

(B1H)

Write clear code

to WDCR

(4EH)

Enable

WDTI interrupt

WDMOD<RESCR>

RESET

Internal reset

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