95
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: Table 5.4 gives settings for various operating frequencies.
Set bits STS2 to STS0 for a waiting time of at least 10 ms.
Table 5.4
Clock Frequency and Settling Time (times are in ms)
STS2
STS1
STS0
Waiting Time
5 MHz
4 MHz
2 MHz
1 MHz
0.5 MHz
0
0
0
8,192 states
1.6
2.0
4.1
8.2
16.4
0
0
1
16,384 states
3.2
4.1
8.2
16.4
32.8
0
1
0
32,768 states
6.6
8.2
16.4
32.8
65.5
0
1
1
65,536 states
13.1
16.4
32.8
65.5
131.1
1
*
*
131,072 states
26.2
32.8
65.5
131.1
262.1
Note:
*
Don’t care
When an External Clock is Used: Any values may be set. Normally the minimum time (STS2 =
STS1 = STS0 = 0) should be set.