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8.3 Register Controlling Watchdog Timer
The watchdog timer is controlled by the watchdog timer enable register (WDTE).
(1) Watchdog timer enable register (WDTE)
Writing "ACH" to WDTE clears the watchdog timer counter and starts counting again.
This register can be set by an 8-bit memory manipulation instruction.
Reset signal generation sets this register to 9AH or 1AH
Figure 8-2. Format of Watchdog Timer Enable Register (WDTE)
Address: FFFABH
7
Symbol
WDTE
Note The WDTE reset value differs depending on the WDTON setting value of the option byte (000C0H). To
operate watchdog timer, set WDTON to 1.
0 (watchdog timer count operation disabled)
1 (watchdog timer count operation enabled)
Cautions 1. If a value other than "ACH" is written to WDTE, an internal reset signal is generated.
2. If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset signal
is generated.
3. The value read from WDTE is 9AH/1AH (this differs from the written value (ACH)).
CHAPTER 8 WATCHDOG TIMER
Note
After reset: 9AH/1AH
R/W
6
5
WDTON Setting Value
User's Manual U17854EJ9V0UD
Note
.
4
3
2
WDTE Reset Value
1AH
9AH
1
0
291
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