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RL78/G1A CHAPTER 10 WATCHDOG TIMER
10.3 Register Controlling Watchdog Timer
The watchdog timer is controlled by the watchdog timer enable register (WDTE).
10.3.1 Watchdog timer enable register (WDTE)
Writing “ACH” to the WDTE register 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
Note
.
Figure 10-2. Format of Watchdog Timer Enable Register (WDTE)
01234567
Symbol
WDTE
Address: FFFABH After reset: 9AH/1AH
Note
R/W
Note The WDTE register reset value differs depending on the WDTON bit setting value of the option byte
(000C0H). To operate watchdog timer, set the WDTON bit to 1.
WDTON Bit Setting Value WDTE Register Reset Value
0 (watchdog timer count operation disabled) 1AH
1 (watchdog timer count operation enabled) 9AH
Cautions 1. If a value other than “ACH” is written to the WDTE register, an internal reset signal is
generated.
2. If a 1-bit memory manipulation instruction is executed for the WDTE register, an internal reset
signal is generated.
3. The value read from the WDTE register is 9AH/1AH (this differs from the written value (ACH)).
R01UH0305EJ0200 Rev.2.00 335
Jul 04, 2013