UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 401

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Cautions 1. The watchdog timer mode register (WDM) can only be written to with a dedicated instruction
WDM
RUN
2. The same value should be written each time in writes to the WDM to set (1) the RUN bit. The
3. Once the RUN bit has been set (1), it cannot be reset (0) by software.
7
(MOV WDM, #byte).
contents written the first time cannot be changed even if a different value is written.
6
0
Figure 12-2 Watchdog Timer Mode Register (WDM) Format
5
0
PRC
4
CHAPTER 12 WATCHDOG TIMER FUNCTION
3
0
WDI2
2
WDI1
1
0
0
Remark f
WDI2
RUN
PRC
Address
FFC2H
0
0
1
1
0
1
0
1
WDI2
Watchdog Timer Interrupt Request Priority
Specification
Watchdog timer interrupt request <
NMI pin input interrupt request
Watchdog timer interrupt request >
NMI pin input interrupt request
Watchdog Timer Operation Specification
Watchdog timer stopped
Clear watchdog timer and start count
CLK
0
1
0
1
: Internal System Clock Frequency
On Reset
00H
2
2
2
2
17
19
20
21
/f
/f
/f
/f
CLK
CLK
CLK
CLK
Overflow Time [ms]
(10.49)
(41.94)
(83.89)
(167.8)
f
R/W
R/W
CLK
=12.5 MHz
361