Programming Model
MOTOROLA
Watchdog Timer Module
14-7
14.7.2 Watchdog Service Register
The Watchdog Service register contains the watchdog service sequence. When Watchdog is enabled, the
Watchdog requires that a service sequence be written to the Watchdog Service Register (WSR) as
described in Table 14-3.
WT[6:0]
Bits 14–8
Watchdog Time-Out Field
—This 7-bit field contains the
time-out value and is loaded into the Watchdog counter after
the service routine has been performed. After reset, WT[6:0]
must be written before enabling the Watchdog.
Set to desired time-out value.
Reserved
Bits 7–5
Reserved—These bits are reserved and should read 0.
WIE
Bit 4
Watchdog Interrupt Enable
—Determines if the WDT_RST is
asserted or WDT_INT is asserted upon a watchdog time-out.
1 = Assert WDT_INT
0 = Assert WDT_RST
TMD
Bit 3
Test Mode Enable
—Determines if WDOG timer is in test
mode.
Note:
This bit is used only for test purposes
0 = Use 2 Hz clock as counter clock
1 = Use CLK32K as counter clock
SWR
Bit 2
Software Reset Enable
—Determines if a software reset is
enabled.
0 = Software reset is not enabled
1 = Software reset is enabled
WDEC
Bit 1
Watchdog Enable Control
—Controls the write access of the
WDE bit.
0 = WDE bit is write once only
1 = WDE bit is write multiple
WDE
Bit 0
Watchdog Enable
—Enables or disables the watchdog
module.
Write once-only if WDEC bit is low. Write multiple if
WDEC bit is high
0 = Disable Watchdog
1 = Enable Watchdog
WSR
Watchdog Service Register
Addr
0x00201004
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
WSR
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 14-2. Watchdog Control Register Description (Continued)
Name
Description
Settings
Summary of Contents for DragonBall MC9328MX1
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Page 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
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