ST9 datasheet(110/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

4.8.2.6 WDT File

4.8.2.6.1 WDT Files for PWM Generation

The WDT function file is <wdt\appli1\wdt.c> and contains 7 functions that are initialized for

generating a simple PWM signal using the WDT (programmable duty cycle).

Port used:

– WDOUT

Table 13.

WDT.C Functions

4.8.2.6.2 WDT Files in Watchdog Mode

The WDT function file is <wdt\appli2\wdt.c> and contains 4 functions that are initialized for en-

abling the WDT in Watchdog mode and refreshes it regularly.

No port is used.

Table 14.

WDT.C Functions

FUNCTION

DESCRIPTION AND COMMENTS

void INIT_WDT(void);

WDT initialization.

It must be used before any use of the WDT.

It initializes the value loaded into the prescaler and into the counter.

To use the WDT in output mode, you must initialize the output pin in push

pull, alternate function. This means (PXC0R,PXC1R,PXC2R) = (1,1,0)

void START_WDT(void);

Start the Watchdog Timer.

void STOP_WDT (void);

It stops the counting of the timer (useless in watchdog mode).

void

Restart_Watchdog(void);

This routine refreshes the Watchdog counter: At each End of Count, if this

function has not been used before, a reset is generated internally.

The periodic use of this function is the only way to avoid a reset.

void INIT_WDT_IT(void);

This routine configure the interrupts after each End of Count using inter-

rupt channel INTA0. NMI is thus configured as the Top Level Interrupt.

Don't forget to initialize your start-up file correctly.

void Enable_WDT_IT(void)

Enable the WDT interrupt.

void

INTWDT_EndCount(void);

Interrupt subroutine which occurs after an end of count.

The code written in the user part allow the generation of a simple PWM

signal (programmable duty cycle).

FUNCTION

DESCRIPTION AND COMMENTS

void INIT_WDT(void);

WDT initialization.

It must be used before any use of the WDT.

It initializes the value loaded into the prescaler and into the counter.

void START_WDT(void);

Start the Watchdog Timer.

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