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CHAPTER 10 WATCHDOG TIMER FUNCTION
User’s Manual U15109EJ3V0UD
323
10.5 Standby Function Control Register
(1) Oscillation stabilization time select register (OSTS)
The wait time from when the stop mode is cancelled until the oscillation stabilizes is controlled by the oscillation
stabilization time select register (OSTS).
OSTS is set by an 8-bit memory manipulation instruction.
RESET input sets OSTS to 01H.
After reset: 01H
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
18.87 MHz
16 MHz
0
0
0
2
16
/f
XX
3.3 ms
3.5 ms
4.1 ms
0
0
1
2
18
/f
XX
(after reset)
13.1 ms
13.9 ms
16.4 ms
0
1
0
2
19
/f
XX
26.2 ms
27.8 ms
32.8 ms
0
1
1
2
20
/f
XX
52.4 ms
55.6 ms
65.5 ms
1
0
0
2
21
/f
XX
104.9 ms
111.1 ms
131.1 ms
Other than above
Setting prohibited
Caution
The wait time at the cancellation of the STOP mode does not include the time (“a” in the figure
below) until clock oscillation starts after STOP mode is cancelled by RESET input or interrupt
generation.
V
SS
STOP mode cancellation
a
Voltage
waveform
at X1 pin