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CHAPTER 15 STANDBY FUNCTION
User’s Manual U15075EJ2V1UD
283
15.1.2 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
15
/f
X
, not 2
17
/f
X
, after RESET input.
Caution When RC oscillation is selected, the oscillation stabilization time cannot be selected using
OSTS.
In the case of RC oscillation, the oscillation stabilization time is fixed to 2
7
/f
CC
.
Figure 15-1. Format of Oscillation Stabilization Time Select Register
OSTS2
0
0
1
0
0
0
0
0
OSTS2 OSTS1 OSTS0
OSTS
R/W
FFFAH
04H
R/W
7
6
5
4
3
2
1
0
OSTS1
0
1
0
2
12
/f
X
2
15
/f
X
2
17
/f
X
(819 s)
(6.55 ms)
(26.2 ms)
OSTS0
0
0
0
Setting prohibited
Symbol
Address
After reset
Oscillation stabilization time selection
Other than above
µ
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 whether STOP mode is
released by RESET input or by interrupt generation.
a
STOP mode release
X1 pin voltage
waveform
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
The parenthesized values apply to operation at f
X
= 5.0 MHz.
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