Kontron COMe-bP5020 - Manual (Page 39)

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User Guide
COMe-bP5020
Table 23: Address: 0x288 - Board ID High Byte Register (BIDH)
Table 24: Address: 0x289 - Board and PLD Revision Register (BREV)
Table 25: Address: 0x28C - Watchdog Timer Control Register (W TIM)
BIT 7 6 5 4 3 2 1 0
NAME BIDH
ACCESS R
RESET 0xD0
BITFIELD DESCRIPTION
[7:0] BIDH Board identif ication: 0xD0C8
0xD0 = COMe-bP5020 (high byte)
BIT 7 6 5 4 3 2 1 0
NAME BREV PREV
ACCESS R R
RESET N/A N/A
BITFIELD DESCRIPTION
[7:4] BREV Board revision
[3:0] PREV PLD revision
BIT 7 6 5 4 3 2 1 0
NAME WTE WMD WEN/WTR WTM
ACCESS R/W R/W R/W R/W
RESET 0 00 0 0000
BITFIELD DESCRIPTION
[7] WTE Watchdog timer expired status bit
0 = Watchdog timer has not expired
1 = Watchdog timer has expired.
Writing a ‘1’ to this bit resets it to 0.
[6:5] WMD Watchdog mode
00 = Timer Only mode
01 = Reset mode
10 = Interrupt mode
11 = Cascaded mode (dual-stage mode)
[4] WEN/WTR Watchdog enable / Watchdog trigger control bit:
0 = Watchdog timer not 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 = Watchdog timer enabled
Writing a ‘1’ to this bit causes the Watchdog to be retriggered to the timer value indi-
cated by bits WTM[3:0].
[3:0] WTM Watchdog timeout settings:
0000 = 0.125 s
0001 = 0.25 s
0010 = 0.5 s
0011 = 1 s
0100 = 2 s
0101 = 4 s
0110 = 8 s
0111 = 16 s
1000 = 32 s
1001 = 64 s
1010 = 128 s
1011 = 256 s 1100 = 512 s
1101 = 1024 s
1110 = 2048 s
1111 = 4096 s