246
CHAPTER 20 STANDBY FUNCTION
20.1.2 Standby function control register
The wait time after the STOP mode is cleared upon interrupt request 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.
Figure 20-1. Oscillation Stabilization Time Select Register (OSTS) Format
Address: FFFAH After Reset: 04H R/W
Symbol
7
6
5
4
3
2
1
0
OSTS
0
0
0
0
0
OSTS2
OSTS1
OSTS0
OSTS2
OSTS1
OSTS0
Selection of Oscillation Stabilization Time
0
0
0
2
12
/f
X
(488
µ
s)
0
0
1
2
14
/f
X
(1.95 ms)
0
1
0
2
15
/f
X
(3.91 ms)
0
1
1
2
16
/f
X
(7.81 ms)
1
0
0
2
17
/f
X
(15.6 ms)
Other than above
Setting prohibited
Caution
The wait time after the STOP mode is cleared does not include the time (see “a” in the illustration
below) from STOP mode clear to clock oscillation start, regardless of clearance by RESET input
or by interrupt request generation.
STOP mode clear
X1 pin voltage
waveform
V
SS
a
Remarks 1. f
X
: Main system clock oscillation frequency
2. Values in parentheses apply to operation with f
X
= 8.38 MHz.
Summary of Contents for mPD780973 Series
Page 2: ...2 MEMO ...
Page 66: ...66 MEMO ...
Page 98: ...98 MEMO ...
Page 138: ...138 MEMO ...
Page 164: ...164 MEMO ...
Page 182: ...182 MEMO ...
Page 204: ...204 MEMO ...
Page 244: ...244 MEMO ...
Page 262: ...262 MEMO ...
Page 278: ...278 MEMO ...
Page 290: ...290 MEMO ...