upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 217

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(3) Watchdog timer mode register (WDTM)
Notes 1.
Caution If RUN is set (1) and the watchdog timer is cleared, the actual overflow time can be up to
This register sets the operating mode of the watchdog timer, and enables and disables counting.
WDTM is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets WDTM to 00H.
2.
After reset: 00H
WDTM
2
Once RUN is set (1), the register cannot be cleared (0) by software. Therefore, when counting
starts, counting cannot be stopped except by RESET input.
Once WDTM4 is set (1), the register cannot be cleared (0) by software.
10
/f
XX
[seconds] shorter than the set time.
WDTM4
RUN
RUN
7
0
1
0
1
R/W
Disable count
Clear count and start counting
Interval timer mode
(If an overflow occurs, the maskable interrupt INTWDTM is generated.)
Watchdog timer mode 1
(If an overflow occurs, the non-maskable interrupt INTWDT is generated.)
6
0
CHAPTER 9
User’s Manual U12768EJ4V1UD
Operating Mode Selection for Watchdog Timer
Operating Mode Selection for Watchdog Timer
5
0
Address: FFFFF384H
WDTM4
WATCHDOG TIMER
4
3
0
2
0
Note 1
Note 2
1
0
0
0
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