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12.1.2 Register controlling standby function
The wait time after the STOP mode is released upon interrupt request until oscillation stabilizes is controlled with
the oscillation stabilization time select register (OSTS).
OSTS is set with an 8-bit memory manipulation instruction.
RESET input sets OSTS to 04H. However, it takes 2
Figure 12-1. Format of Oscillation Stabilization Time Select Register
Symbol
7
6
5
OSTS
0
0
0
OSTS2
OSTS1
OSTS0
0
0
0
0
1
0
1
0
0
Other than above
Caution
The wait time after the STOP mode is released does not include the time from STOP mode
release to clock oscillation start ("a" in the figure below), regardless of release by RESET input
or by interrupt generation.
Remarks 1. f
: System clock oscillation frequency
X
2. The parenthesized values apply to operation at f
CHAPTER 12
STANDBY FUNCTION
15
/f
4
3
2
1
0
0
OSTS2 OSTS1 OSTS0
Oscillation stabilization time selection
12
µ
2
/f
(683 s)
X
15
2
/f
(5.46 ms)
X
17
2
/f
(21.8 ms)
X
Setting prohibited
STOP mode release
X1 pin voltage
waveform
User's Manual U12978EJ3V0UD
until oscillation stabilizes after RESET input.
X
0
Address
After reset
FFFAH
04H
a
= 6.0 MHz.
X
R/W
R/W
179
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