Motorola ColdFire MCF5281 - Manual (Page 358)

Watchdog Timer Module
18-4 Freescale Semiconductor
18.5.2.2 Watchdog Modulus Register (WMR)
Table 18-3. WCR Field Descriptions
Bit(s) Name Description
15–4 — Reserved, should be cleared.
3 WAIT Wait mode bit. Controls the function of the watchdog timer in wait mode. Once written,
the WAIT bit is not affected by further writes except in halted mode. Reset sets WAIT.
1 Watchdog timer stopped in wait mode
0 Watchdog timer not affected in wait mode
2 DOZE Doze mode bit. Controls the function of the watchdog timer in doze mode. Once
written, the DOZE bit is not affected by further writes except in halted mode. Reset
sets DOZE.
1 Watchdog timer stopped in doze mode
0 Watchdog timer not affected in doze mode
1 HALTED Halted mode bit. Controls the function of the watchdog timer in halted mode. Once
written, the HALTED bit is not affected by further writes except in halted mode.
During halted mode, watchdog timer registers can be written and read normally. When
halted mode is exited, timer operation continues from the state it was in before
entering halted mode, but any updates made in halted mode remain. If a write-once
register is written for the first time in halted mode, the register is still writable when
halted mode is exited.
1 Watchdog timer stopped in halted mode
0 Watchdog timer not affected in halted mode
Note: Changing the HALTED bit from 1 to 0 during halted mode starts the watchdog
timer. Changing the HALTED bit from 0 to 1 during halted mode stops the watchdog
timer.
0 EN Watchdog enable bit. Enables the watchdog timer. Once written, the EN bit is not
affected by further writes except in halted mode. When the watchdog timer is disabled,
the watchdog counter and prescaler counter are held in a stopped state.
1 Watchdog timer enabled
0 Watchdog timer disabled
15 14 13 12 11 10 9 8
Field WM15 WM14 WM13 WM12 WM11 WM10 WM9 WM8
Reset 1111_1111
R/W R/W
7 6 5 4 3 2 1 0
Field WM7 WM6 WM5 WM4 WM3 WM2 WM1 WM0
Reset 1111_1111
R/W R/W
Address IPSBAR + 0x0014_0002, 0x0014_0003
Figure 18-3. Watchdog Modulus Register (WMR)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3