CHAPTER 9 WATCHDOG TIMER
User’s Manual U13850EJ4V0UM
238
9.2 Configuration
The watchdog timer includes the following hardware.
Table 9-3. Configuration of Watchdog Timer
Item
Configuration
Control registers
Oscillation stabilization time selection register (OSTS)
Watchdog timer clock selection register (WDCS)
Watchdog timer mode register (WDTM)
9.3 Watchdog Timer Control Register
The registers to control the watchdog timer is shown below.
• 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 after a reset is applied or the STOP mode is released until
the oscillation is stable.
OSTS is set by an 8-bit memory manipulation instruction.
RESET input sets OSTS to 04H.
Figure 9-2. Oscillation Stabilization Time Selection Register (OSTS)
After reset: 04H
R/W
Address: FFFFF380H
7
6
5
4
3
2
1
0
OSTS
0
0
0
0
0
OSTS2
OSTS1
OSTS0
Oscillation stabilization time selection
f
XX
OSTS2
OSTS1
OSTS0
Clock
20 MHz
Note
12.58 MHz
0
0
0
2
14
/f
XX
819.2
µ
s
1.3 ms
0
0
1
2
16
/f
XX
3.3 ms
5.2 ms
0
1
0
2
17
/f
XX
6.6 ms
10.4 ms
0
1
1
2
18
/f
XX
13.1 ms
20.8 ms
1
0
0
2
19
/f
XX
(after reset)
26.2 ms
41.6 ms
Other than above
Setting prohibited
Note
Only for the V850/SB1.
Содержание MPD703030A
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