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Chapter 11
Watchdog Timer
Preliminary User’s Manual U14913EE1V0UM00
11.2 Control
Register
11.2.1 Watchdog timer mode register (WDTM)
This register sets the operating mode of the watchdog timer, and enables and disables counting.
This register sets the overflow times of the watchdog timer.
WDTM is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets WDTM to 00H.
Note: If WDTEN is once set to 1, the register cannot be cleared to 0 by software. Therefore, when the
count starts, the count cannot be stopped except by RESET input.
Caution: If WDTEN is set to 1, the register cannot be cleared. The actual overflow time is a
maximum of 0.5% less than the set time.
7
6
5
4
3
2
1
0
Address
R/W
At
Reset
WDTM WDTEN
WDTM
0
0
0
WDCK2 WDCK1 WDCK0 FFFFF570H R/W
00H
Bit name
Function
WDTEN
Watch Dog Timer enable
Starts/Stops and clears Watch Dog Timer
0: Watch Dog Timer not started
1: clear counter and start counting/continue counting
Note:
Once set, only a reset signal clears this bit!
WDTM
Watch Dog Timer Mode
Selects event type:
0: watch dog timer generates NMI
1: watch dog timer generates reset (once set to 1, only reset can clear)
WTCK2 to
WTCK0
Count Enable Select
WTCK2
WTCK1
WTCK0
Watchdog Time
0
0
0
2
15
/f
CKSEL1
(4 MHz:
→
1.04 s)
0
0
1
2
14
/f
CKSEL1
(4 MHz:
→
0.52 s)
0
1
0
2
6
/f
CKSEL1
(4 MHz:
→
0.002 s)
0
1
1
2
5
/f
CKSEL1
(4 MHz:
→
0.001 s)
1
0
0
2
15
/f
CKSEL2
(4 MHz:
→
4.19 s)
1
0
1
2
14
/f
CKSEL2
1
1
0
2
6
/f
CKSEL2
1
1
1
2
5
/f
CKSEL2
Notes:
1. f
CKSEL1
= f
SUB
/ 128; f
CKSEL2
= f
SUB
/ 512
2. for f
CKSEL1
/f
CKSEL2
refer to Chapter 8.2 “Configuration” on page 225.
Summary of Contents for V850E/CA1 ATOMIC
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