Motorola MVME2400 Series Service Manual Page 149

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Registers
http://www.mcg.mot.com/literature 2-91
2
WDTxCNTL Registers
The Watchdog Timer Control Registers
(WDT1CNTL and
WDT2CNTL) are used to provide control information to the watchdog
timer functions within the PHB. The fields within WDTxCNTL registers
are defined as follows:
KEY Key. This field is used during the two step arming process
of the Control register. This field is sensitive to the
following data patterns:
PATTERN_1 = $55
PATTERN_2 = $AA
The Control register will be in the armed state if
PATTERN_1 is written to the KEY field. The Control
register will be changed if in the armed state and
PATTERN_2 is written to the KEY field. An incorrect
sequence of patterns will cause the Control register to be
in the unarmed state.
A value of all zeros will always be returned within the
KEY field during read cycles.
Address WDT1CNTL - $FEFF0060
WDT2CNTL - $FEFF0068
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Name
WDTxCNTL
KEY
ENAB
ARM
RES RELOAD
Operation W
R/W
R
RR/W R/W
Reset $00
1
0
00 $7 or $8 $FF
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