Watchdog control register - 10, Configuration vmp3 – Kontron VMP3 User Manual
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Configuration
VMP3
Page 4 - 10
© 2005 Kontron Modular Computers GmbH
ID 29230, Rev. 01
29230
.01.UG.VC.050727/091435
P R E L I M I N A R Y
other modes the WTE bit is available for application use.
Refer to Appendix A for further information regarding the Watchdog functional logic.
Table 4-9: Watchdog Control Register
REGISTER NAME
WATCHDOG CONTROL
ACCESS
ADDRESS
0xFFFF A008
R
W
BIT POSITION
MSB
7
6
5
4
3
2
1
0
LSB
CONTENT
WTE
WDM1
WDM0
WEN/WTR
WTM3
WTM2
WTM1
WTM0
DEFAULT
0
0
0
0
0
0
0
0
BIT CONTENT STATE
DESCRIPTION
0
WTM0
0
Watchdog timeout time:
Settings: WTM3 WTM2 WTM1 WTM0
0
0
0
0
125 ms
0
0
0
1
250 ms
0
0
1
0
500 ms
0
0
1
1
1 s
0
1
0
0
2 s
0
1
0
1
4 s
0
1
1
0
8 s
0
1
1
1
16 s
1
0
0
0
32 s
1
0
0
1
64 s
1
0
1
0
128 s
1
0
1
1
256 s
1
1
0
0
reserved
1
1
0
1
reserved
1
1
1
0
reserved
1
1
1
1
reserved
1
1
WTM1
0
1
2
WTM2
0
1
3
WTM3
0
1
4
WEN/WTR
0
Indicates that the Watchdog timer has not been enabled.
Prior to the Watchdog being enabled, this bit is known as WEN. After the
Watchdog is enabled, it is known as WTR. Once the Watchdog timer has
been enabled, this bit cannot be reset to 0. As long as the Watchdog timer
is enabled it will indicate a 1.
1
Indicates that the Watchdog timer is enabled.
Writing a ’1’ to this bit causes the Watchdog to be retriggered to the timer
value indicated by bits WTM[3:0].
5
WMD0
0
Watchdog mode:
Settings: WMD1 WMD0
Mode
0
0
Timer only
0
1
Reset
1
0
Interrupt
1
1
Dual Stage
1
6
WMD1
0
1
7
WTE
0
Indicates that the Watchdog timer has not expired.
1
Indicates that the Watchdog timer has expired.
Writing a ’1’ to this bit resets it to 0.