RL78/G1P
CHAPTER 8 WATCHDOG TIMER
R01UH0895EJ0100 Rev.1.00
235
Nov 29, 2019
8.3 Register Controlling Watchdog Timer
The watchdog timer is controlled by the watchdog timer enable register (WDTE).
8.3.1 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 8-2. Format of Watchdog Timer Enable Register (WDTE)
0
1
2
3
4
5
6
7
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)).