User`s guide

Appendix B • 55
B.1 WDT Setup Procedures
Followings are the Watch Dog Timer setup procedures:
1. Set pin 55 of PC87417 as Watch Dog Timer output pin
ÆSet Bit 7 of SIOCF2 Register (Index: 22H) to 1, for example:
• o 2E 22
• o 2F 80
2. Set Logic Device to System Wake-Up Control (SWC)
ÆSet Logic Device Number Register (Index: 07H) to 04H, for example:
• o 2E 07
• o 2F 04
3. Enable Logic Device Control
ÆSet Logic Device Control Register (Index: 30H) to 01H, for example:
• o 2E 30
• o 2F 01
4. Get I/O Base Address (MSB) of SWC
ÆGet SWC base address MSB from 60H, for example:
• o 2E 60
• i 2F
• 08 ÆBIOS default value
5. Get I/O Base Address (LSB) of SWC
ÆGet SWC base address MSB from 61H, for example:
• o 2E 61
• i 2F
• 40 ÆBIOS default value
(The I/O Base Address of SWC BIOS set is 840H)