CPC309 Intel Atom D510-based SBC
Specification
6 CPC309 Programming
6.1 Work with WDT1 Watchdog Timer
After the module loading POST is over, the WDT watchdog timer is off. This timer can be
controlled by the user with the help of GPIO outputs of the ICH8 chipset.
Two registers are available for that purpose in the I/O space; the table below specifies the
purposes and addresses of those registers.
Table 6-1: WDT1 Watchdog Timer Control Registers
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
118Eh
reserved WDT1_EN# reserved reserved
reserved
reserved
reserved
reserved
11B8h
reserved
WDT1_RES
reserved
reserved
reserved
reserved
reserved
reserved
Where:
– WDT1_EN# –watchdog timer activation bit (when recorded: “1”- WDT1 watchdog timer is on,
“0” – WDT1 watchdog timer is off);
– WDT1_RES – watchdog timer resetting bit (the watchdog timer is reset when the status
of this bit is changed);
ATTENTION: THE WATCHDOG TIMER OPERATION TIME IS FIXED; 1.6 SEC AFTER
THE WDT1_EN BIT IS INSTALLED, THE WDT1 WATCHDOG TIMER WILL ACTUATE.
FORBIDDEN: ASSIGN ANY VALUES TO THE BITS DESIGNATED AS "RESERVED".
THIS CAN DISRUPT THE MODULE FUNCTIONING.