Setting Oscillation Stabilization Time After Clearing Software Standby Mode; Table 20.3 Oscillation Stabilization Time Settings - Renesas H8S Series Hardware Manual

20.4.3

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 stabilization
time).
Table 20.3 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 stabilization. Set bits STS0 to STS2 so that the standby
time is at least 2 ms.

Table 20.3 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: * Setting prohibited
20
Standby Time MHz
8192 states 0.41
16384 states 0.82
32768 states 1.6
65536 states 3.3
131072 states 6.6
262144 states 13.1
Reserved —
16 states *
0.8
Section 20 Power-Down Modes
16 12 10 8
MHz MHz MHz MHz
0.51 0.68 0.8 1.0
1.0 1.3 1.6 2.0
2.0 2.7 3.3 4.1
4.1 5.5 6.6 8.2
8.2 10.9 13.1 16.4
16.4 21.8 26.2 32.8
— — — —
1.0 1.3 1.6 2.0
Rev. 6.00 Mar 15, 2006 page 501 of 570
6 4
MHz MHz Unit
1.3 2.0 ms
2.7 4.1
5.5 8.2
10.9 16.4
21.8 32.8
43.6 65.6
— — —
1.7 4.0 µs
REJ09B0211-0600