Rev. 1.0, 09/02, page 486 of 568
21.4.3
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 STS0 to STS2 so that the standby time is at least 8 ms (the oscillation settling time).
Table 21.3 shows the standby times for different operating frequencies and settings of bits
STS0 to STS2.
•
Using an External Clock
The PLL circuit requires a time for settling. Set bits STS0 to STS2 so that the standby time is
at least 2 ms(the oscillation settling time).
Table 21.3 Oscillation Stabilization Time Settings
STS2 STS1 STS0 Standby
Time
24
MHz
20
MHz
16
MHz
12
MHz
10
MHz
8
MHz
6
MHz
4
MHz Unit
0
8192
states
0.34 0.41 0.51 0.68 0.8 1.0 1.3 2.0
0
1
16384
states 0.68
0.82
1.0 1.3 1.6 2.0 2.7 4.1
0
32768
states 1.4 1.6 2.0 2.7 3.3 4.1 5.5 8.2
0
1
1
65536
states 2.7 3.3 4.1 5.5 6.6 8.2
10.9 16.4
0 131072
states
5.5
6.6
8.2
10.9 13.1 16.4 21.8 32.8
0
1 262144
states
10.9 13.1 16.4 21.8 26.2 32.8 43.6 65.6
ms
0 Reserved
1
1
1 16
states
*
0.7 0.8 1.0 1.3 1.6 2.0 1.7 4.0 µs
: Recommended time setting
Note:
*
Cannot be used in this LSI.
Summary of Contents for H8S/2627
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