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CHAPTER 11 WATCHDOG TIMER
236
(2) Watchdog timer mode register (WDTM)
This register sets the watchdog timer operating mode and enables/disables counting.
WDTM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets WDTM to 00H.
Figure 11-3. Watchdog Timer Mode Register Format
Symbol
<7>
6
5
4
3
2
1
0
Address
When Reset
R/W
WDTM
RUN
0
0
WDTM4 WDTM3
0
0
0
FFF9H
00H
R/W
WDTM4 WDTM3 Watchdog Timer Operating Mode
Selection
Note 1
0
x
Interval timer Mode
Note 2
(Maskable interrupt request occurs
upon generation of an overflow.)
1
0
Watchdog timer mode 1
(Non-maskable interrupt request
occurs upon generation of an
overflow.)
1
1
Watchdog timer mode 2
(Reset operation is activated upon
generation of an overflow.)
RUN
Watchdog Timer Operation Selection
Note 3
0
Count stop
1
Counter is cleared and counting starts.
Notes
1. Once set to 1, WDTM3 and WDTM4 cannot be cleared to 0 by software.
2. Interval timer operation starts when the RUN bit is set to 1.
3. Once set to 1, RUN cannot be cleared to 0 by software. Thus, once counting starts, it can only be stopped
by RESET input.
Cautions
1.
When 1 is set in RUN so that the watchdog timer is cleared, the actual overflow time may be
up to 0.5% shorter than the time set by timer clock select register 2 (TCL2).
2.
In watchdog timer mode 1 or 2, make sure that the interrupt request flag (TMIF4) is set to 0
before setting WDTM4 to 1. If WDTM4 is set to 1 while TMIF4 is set to 1, a non-maskable
interrupt request occurs regardless of the contents in WDTM3.
Remark
x: don’t care
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