526
CHAPTER 23 STANDBY FUNCTION
Address
FFFAH 04H
After
Reset R/W
R/W
0
0
0
0
1
Selection of Oscillation Stabilization
Time when STOP Mode is Released
2
12
/f
xx
2
14
/f
xx
2
15
/f
xx
2
16
/f
xx
2
17
/f
xx
OSTS2
7
0
Symbol
OSTS
6
0
5
0
4
0
3
0
2
OSTS2
1
OSTS1
0
OSTS0
0
0
1
1
0
Other than above
OSTS1
MCS = 1 MCS = 0
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)
2
13
/f
x
(1.64 ms)
2
15
/f
x
(6.55 ms)
2
16
/f
x
(13.1 ms)
2
17
/f
x
(26.2 ms)
2
18
/f
x
(52.4 ms)

m

0
1
0
1
0
OSTS0
Setting prohibited

STOP Mode Clear

X1 Pin

Voltage

Waveform

V

SS

a

23.1.2 Standby function control registerA wait time after the STOP mode is cleared upon interrupt request till the oscillation stabilizes is controlled withthe 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 217/fX, not 218/fX, until the STOP mode is cleared by RESETinput.Figure 23-1. Oscillation Stabilization Time Select Register FormatCaution The wait time after STOP mode clear 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 byinterrupt request generation.Remarks 1. fXX :Main system clock frequency (fX or fX/2)2. fX:Main system clock oscillation frequency3. MCS :Bit 0 of oscillation mode select register (OSMS)4. Values in parentheses apply to operating at fX = 5.0 MHz