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CHAPTER 17 STANDBY FUNCTION
17.1.2 Standby function control register
The wait time after the STOP mode is released by an interrupt request until the oscillation stabilizes is controlled by the oscillation stabilization time select register (OSTS).
OSTS is set with an 8-bit memory manipulation instruction.
RESET input sets OSTS to 04H. Therefore, when the STOP mode is released by RESET input, the time until it is released is 2
17
/fx.
Figure 17-1. Format of Oscillation Stabilization Time Select Register
Symbol
OSTS
7
0
6
0
5
0
4
0
3 2 1 0 Address After reset R/W
0 OSTS2 OSTS1 OSTS0 FFFAH 04H R/W
OSTS2 OSTS1 OSTS0
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
Other than above
Selection of oscillation stabilization time after STOP mode is released
2
12
/f
X
(819 s)
2
14
/f
X
(3.28 ms)
2
15
/f
X
(6.55 ms)
2
16
/f
X
(13.1 ms)
2
17
/f
X
(26.2 ms)
Setting prohibited
Caution The wait time after STOP mode release does not include the time from STOP mode release to clock oscillation start (see “a” below), regardless of whether the STOP mode is released by RESET input or by interrupt request generation.
STOP mode release
X1 pin voltage waveform
V
SS a
Remarks 1. f
X
: Main system clock oscillation frequency
2. Figures in parentheses apply to operation with f
X
= 5.0 MHz.
352
User’s Manual U11302EJ5V0UD
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