MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 303

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

14.6.2.4 Watchdog Service Register
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
Address: 0x00c7_0006 and 0x00c7_0007
When the watchdog timer is enabled, writing 0x5555 and then 0xAAAA
to the Watchdog Service Register (WSR) before the watchdog counter
times out prevents a reset. If WSR is not serviced before the timeout, the
watchdog timer sends a signal to the reset controller module which sets
the WDR bit and asserts a system reset.
Both writes must occur in the order listed before the timeout, but any
number of instructions can be executed between the two writes.
However, writing any value other than 0x5555 or 0xAAAA to WSR resets
the servicing sequence, requiring both values to be written to keep the
watchdog timer from causing a reset.
Reset:
Reset:
Read:
Read:
Write:
Write:
Freescale Semiconductor, Inc.
For More Information On This Product,
WS15
Bit 15
WS7
Bit 7
Figure 14-5. Watchdog Service Register (WSR)
0
0
Go to: www.freescale.com
Watchdog Timer Module
WS14
WS6
14
0
6
0
WS13
WS5
13
0
5
0
WS12
WS4
12
0
4
0
WS11
WS3
11
0
3
0
Memory Map and Registers
WS10
WS2
10
0
2
0
Watchdog Timer Module
Advance Information
WS9
WS1
9
0
1
0
WS8
WS0
Bit 8
Bit 0
0
0
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