CHAPTER 9 WATCHDOG TIMER FUNCTIONS
Preliminary User’s Manual U15905EJ1V0UD
275
9.2
Configuration
The watchdog timer consists of the following hardware.
Table 9-1. Configuration of Watchdog Timer
Item
Configuration
Control register
Oscillation stabilization time selection register (OSTS)
Watchdog timer clock selection register (WDCS)
Watchdog timer mode register (WDTM)
9.3
Watchdog Timer Control Registers
The registers that control the watchdog timer are as follows.
•
Oscillation stabilization time selection register (OSTS)
•
Watchdog timer clock selection register (WDCS)
•
Watchdog timer mode register (WDTM)
(1) Oscillation stabilization time selection register (OSTS)
This register selects the oscillation stabilization time following reset or release of the stop mode.
The OSTS register is set by an 8-bit or 1-bit memory manipulation instruction.
RESET input sets OSTS to 01H.
0
OSTS
0
0
0
0
OSTS2
OSTS1
OSTS0
2
14
/f
X
2
16
/f
X
2
17
/f
X
2
18
/f
X
2
19
/f
X
2
20
/f
X
2
21
/f
X
2
22
/f
X
OSTS2
0
0
0
0
1
1
1
1
Selection of oscillation stabilization time
OSTS1
0
0
1
1
0
0
1
1
OSTS0
0
1
0
1
0
1
0
1
13.5 MHz
8 MHz
2.048 ms
8.192 ms
16.38 ms
32.77 ms
65.54 ms
131.1 ms
262.1 ms
524.3 ms
17 MHz
Setting prohibited
3.855 ms
7.710 ms
15.42 ms
30.84 ms
61.68 ms
123.4 ms
246.7 ms
Setting prohibited
4.855 ms
9.709 ms
19.42 ms
38.84 ms
77.67 ms
155.3 ms
310.7 ms
f
X
After reset:
04H R/W
Address:
FFFFF6C0H
Caution
Set the oscillation stabilization time to 1.5 ms or longer.
Содержание V850ES/SA2 UPD703201
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