upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 215

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

9.2 Configuration
Control registers
9.3 Watchdog Timer Control Register
(1) Oscillation stabilization time select register (OSTS)
The watchdog timer consists of the following hardware.
Three registers control the watchdog timer.
• Oscillation stabilization time select register (OSTS)
• Watchdog timer clock select register (WDCS)
• Watchdog timer mode register (WDTM)
This register selects the oscillation stabilization time after a reset is applied or the software 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.
OSTS
After reset: 04H
Item
OSTS2
Other than above
0
0
0
0
1
7
0
OSTS1
R/W
0
0
1
1
0
6
0
Table 9-3. Watchdog Timer Configuration
OSTS0
Oscillation stabilization time select register (OSTS)
Watchdog timer clock select register (WDCS)
Watchdog timer mode register (WDTM)
0
1
0
1
0
CHAPTER 9
User’s Manual U12768EJ4V1UD
5
0
2
2
2
2
2
(after reset)
Setting prohibited
Address: FFFFF380H
14
16
17
18
19
/f
/f
/f
/f
/f
XX
XX
XX
XX
XX
Clock
WATCHDOG TIMER
4
0
Oscillation Stabilization Time Selection
819
3.3 ms
6.6 ms
13.1 ms
26.2 ms
20 MHz
µ
s
3
0
Configuration
964
3.855 ms
7.710 ms
15.42 ms
30.84 ms
17 MHz
OSTS2
µ
2
s
f
XX
1.6 ms
6.6 ms
13.1 ms
26.2 ms
52.4 ms
10 MHz
OSTS1
1
8.2 ms
32.8 ms
65.5 ms
131.1 ms
262.1 ms
OSTS0
2 MHz
0
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