Owner manual

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 00000000
BIT CONTENT STATE DESCRIPTION
0WTM0
0
Watchdog timeout time:
Settings: WTM3 WTM2 WTM1 WTM0
0000125ms
0001250ms
0010500ms
0011 1s
0100 2s
0101 4s
0110 8s
011116s
100032s
100164s
1010128s
1011256s
1 1 0 0 reserved
1 1 0 1 reserved
1 1 1 0 reserved
1 1 1 1 reserved
1
1WTM1
0
1
2WTM2
0
1
3WTM3
0
1
4WEN/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].
5WMD0
0
Watchdog mode:
Settings: WMD1 WMD0 Mode
0 0 Timer only
01Reset
1 0 Interrupt
1 1 Dual Stage
1
6WMD1
0
1
7WTE
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.