Intel MB899 user manual Watchdog Timer Configuration, Sample Code

APPENDIX

C. Watchdog Timer Configuration

The WDT is used to generate a variety of output signals after a user programmable count. The WDT is suitable for use in the prevention of system lock-up, such as when software becomes trapped in a deadlock. Under these sorts of circumstances, the timer will count to zero and the selected outputs will be driven. Under normal circumstance, the user will restart the WDT at regular intervals before the timer counts to zero.

SAMPLE CODE:

//===========================================================================

//

//THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY

//KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE

//IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR

//PURPOSE.

//

//=========================================================================== #include <stdio.h>

#include <stdlib.h> #include "W627EHF.H" //=========================================================================== int main (int argc, char *argv[]);

void copyright(void); void EnableWDT(int); void DisableWDT(void); //=========================================================================== int main (int argc, char *argv[])

{

unsigned char bBuf; unsigned char bTime; char **endptr;

copyright();

if (argc != 2)

{

printf(" Parameter incorrect!!\n"); return 1;

}

if (Init_W627EHF() == 0)

{

printf(" Winbond 83627HF is not detected, program abort.\n"); return 1;

}

bTime = strtol (argv[1], endptr, 10);

printf("System will reset after %d seconds\n", bTime);

EnableWDT(bTime);

return 0;

}

//===========================================================================

MB899 User’s Manual 61