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ST9 USER GUIDE

4.3 STANDARD AND WATCHDOG TIMERS

You can use this timer both as a regular timer and as a watchdog timer.

4.3.1 Description

The block diagram of the Watchdog Timer is the following:

Figure 27

. Watchdog Timer Simplified Block Diagram

In Counter/Timer mode, the WDT can count pulses coming either from an input pin (WDIN; in

the ST92F150, alternate function of P5.3) or from the internal clock divided by 4. When the in-

ternal clock is used, the external pin, if enabled, can either gate the clock, start the counter, or

WDIN Pin

Input Modes and

Clock Control Logic

Prescaler (8-bit)

16-bit Downcounter

Output Control

Logic

Reset and Interrupt

Control Logic

Reset and

interrupt

request

to the core

INTCLK/4

3 bits of

WDTCR

2 bits of

WDTCR

3 bits of

WDTCR

1 bit of

WCR

WDOUT Pin

INT0 Pin

NMI Pin

2 bits of

EIVR

A detailed block diagram

is provided in Section 7

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