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16.1.2 Standby function control register ( µ PD789104, 789114 Subseries)
The wait time after the STOP mode is released upon interrupt request until the 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, the oscillation stabilization time after RESET input is 2
17
of 2
/f
.
X
µ PD789104 and 789114 Subseries only.
Note
The µ PD789124 and 789134 Subseries do not provide an oscillation stabilization time select register. The
oscillation stabilization time of the µ PD789124 and 789134 Subseries is fixed to 2
Figure 16-1. Oscillation Stabilization Time Select Register Format
7
6
5
Symbol
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 in a ceramic/crystal oscillator 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
2. Values in parentheses apply to operation with f
220
CHAPTER 16 STANDBY FUNCTION
4
3
2
1
0
0
OSTS2 OSTS1 OSTS0
Oscillation stabilization time selection
µ
12
2
/f
(819 s)
X
15
2
/f
(6.55 ms)
X
17
2
/f
(26.2 ms)
X
Setting prohibited
STOP mode release
X1 pin voltage
waveform
V
SS
: System clock oscillation frequency (ceramic/crystal oscillation)
X
User's Manual U13045EJ2V0UM00
Note
.
0
Address
After reset
FFFAH
04H
a
= 5.0 MHz.
X
15
/f
, instead
X
7
/f
.
CC
R/W
R/W
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