Sintrones VBOX-3200 User Manual page 67

Watchdog Timer Function
Watch dog timer is provided for system controlling. If time-out can trigger one signal to
high/low level/pulse, the signal is depend on register setting.
The time unit has two ways from 1sec or 60sec. In pulse mode, there are four pulse
widths can be selected (1ms/25ms/125ms/5sec). Others, please refer the device
register description as below.
Watchdog Timer Configuration Register 1- base address +05h
Bit Name
7 Reserved
6 WDTMOUT_STS
5 WD_EN
4 WD_PULSE
3 WD_UNIT
2 WD_HACTIVE
1-0 WD_PSWIDTH
Watchdog Timer Configuration Register 2- base address +06h
Bit Name
7-0 WD_TIME
Watchdog PME Control Register - base address + 0Ah
Bit Name
7 WDT_PME
6 WDT_PME_EN
5-1 Reserved
0 WDOUT_EN
User's Manual
R/W Default Description
R 0 Reserved
R/W 0 If watchdog timeout event occurs, this bit will be set to
1. Write a 1 to this bit will clear it to 0.
R/W 0 If this bit is set to 1, the counting of watchdog time is
enabled.
R/W 0 Select output mode (0:level, 1:pulse) of RSTOUT# by
setting this bit.
R/W 0 Select time unit (0:1sec, 1:60sec) of watchdog timer by
setting this bit.
R/W 0 Select output polarity of RETOUT# (1:high active, 0:low
active) by setting the bit.
R/W 0 Select output pulse width of RSTOUT#
0:1 ms
2:125 ms
R/W Default Description
R/W 0 Time of watchdog timer
R/W Default Description
R -- The PME Status
This bit will set when WDT_PME_EN is set and the
watchdog timer is 1 unit before time out (of time out)
R/W 0 0 : Disable Watchdog PME.
1 : Enable Watchdog PME
-- -- Reserved
R/W 0 0 : disable Watchdog time out output via WDTRST#
1 : enable Watchdog time out output via WDTRST#
1:25 ms
3:5 sec
5.0 System Resource
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