Intel MB879 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:

File : ITE8712.H

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

//

//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.

//

//======================================================================= #ifndef __ITE8712_H

#define __ITE8712_H 1

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

#define ITE8712_INDEX_PORT (ITE8712_BASE)

#define ITE8712_DATA_PORT (ITE8712_BASE+1) //=======================================================================

#define ITE8712_REG_LD0x07 //======================================================================= //=======================================================================

#define ITE8712_IO_PORT0x0803 //=======================================================================

#define ITE8712_UNLOCK1	0x87
#define ITE8712_UNLOCK2	0x01
#define ITE8712_UNLOCK3	0x55
#define ITE8712_UNLOCK4	0xAA
#define ITE8712_LOCK	0xFF

//======================================================================= unsigned int Init_ITE8712(void);

void Set_ITE8712_LD( unsigned char);

void Set_ITE8712_Reg( unsigned char, unsigned char); unsigned char Get_ITE8712_Reg( unsigned char); //======================================================================= #endif//__ITE8712_H

MB879 User’s Manual 59