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(2) Exiting Software Standby Mode by RES or MRES Pins
When the RES pin or MRES pin is driven low, clock oscillation is started. At the same time as
clock oscillation starts, clocks are supplied to the entire chip. Note that the RES pin or MRES
pin must be held low until clock oscillation stabilizes. When the RES pin or MRES pin goes
high, the CPU begins reset exception handling.
(3) Exiting Software Standby Mode by STBY Pin
When the STBY pin is driven low, a transition is made to hardware standby mode.
24.6.3
Setting Oscillation Stabilization Time after Clearing Software Standby Mode
Bits STS2 to STS0 in SBYCR should be set as described below.
Using a Crystal Oscillator: Set bits STS2 to STS0 so that the standby time is at least 8 ms (the
oscillation stabilization time).
Table 24-5 shows the standby times for different operating frequencies and settings of bits STS2
to STS0.
Table 24-5 Oscillation Stabilization Time Settings
STS2 STS1 STS0
0
0
0
1
1
0
1
1
0
0
1
1
0
1
: Recommended time setting
Note: * Do not use this setting in the version with built-in flash memory.
Standby
25
20
Time
MHz
MHz
8192
0.32 0.41
states
16384
0.65 0.82
states
32768
1.3
1.6
states
65536
2.6
3.3
states
131072
5.2
6.6
states
262144
10.4
13.1 16.4
states
Reserved —
—
16 states* 0.6
0.8
16
12
10
MHz
MHz
MHz
0.51
0.65
0.8
1.0
1.3
1.6
2.0
2.7
3.3
4.1
5.5
6.6
8.2
10.9
13.1 16.4
21.8
26.2 32.8
—
—
—
1.0
1.3
1.6
8
6
4
MHz
MHz
MHz
1.0
1.3
2.0
2.0
2.7
4.1
4.1
5.5
8.2
8.2
10.9 16.4
21.8
32.8
43.6
65.6
—
—
—
2.0
1.7
4.0
2
MHz Unit
4.1
ms
8.2
16.4
32.8
65.5
131.2
—
µs
8.0
871
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