5.3.3 Oscillator Settling Time after Standby Mode is Cleared
Bits STS2 to STS0 in SYSCR1 should be set as follows.
•
When a crystal oscillator is used
The table below gives settings for various operating frequencies. Set bits STS2 to STS0 for a
waiting time at least as long as the oscillation settling time.
Table 5-4 Clock Frequency and Settling Time (times are in ms)
STS2
STS1
STS0
Waiting Time
2 MHz
1 MHz
0.5 MHz
0
0
0
8,192 states
4.1
8.2
16.4
0
0
1
16,384 states
8.2
16.4
32.8
0
1
0
32,768 states
16.4
32.8
65.5
0
1
1
65,536 states
32.8
65.5
131.1
1
0
0
131,072 states
65.5
131.1
262.1
1
0
1
2 states
0.001
0.002
0.004
(Use prohibited)
1
1
0
8 states
0.004
0.008
0.016
1
1
1
16 states
0.008
0.016
0.032
•
When an external clock is used
STS2 = 1, STS1 = 0, and STS0 = 1 should be set. Other values possible use, but CPU sometimes
will start operation before waiting time completion.
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