Datasheet

Table Of Contents
Section 22 Power-Down Modes
REJ09B0140-0900 Rev. 9.00 Page 691 of 846
Sep 16, 2010
H8S/2215 Group
22.4.3 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 STS2 to STS0 so that the standby time is at least t
OSC2
ms (the oscillation stabilization
time).
Table 22.3 shows the standby times for different operating frequencies and settings of bits
STS2 to STS0.
Using an External Clock
Set bits STS2 to STS0 as any value. Usually, minimum value is recommended. A 16-state
standby time cannot be used in the F-ZTAT version; a standby time of 2,048 states or longer
should be used.
Table 22.3 Oscillation Stabilization Time Settings
STS2 STS1 STS0 Standby Time
24
MHz
*
2
20
MHz
*
1
16
MHz
13
MHz
10
MHz
8
MHz
6
MHz
4
MHz
2
MHz
Unit
0 8192 states 0.3 0.4 0.51 0.6 0.8 1.0 1.3 2.0
4.1 0
1 16384 states 0.7 0.8 1.0 1.3 1.6 2.0 2.7
4.1 8.2
0 32768 states 1.4 1.6 2.0 2.5 3.3 4.1 5.5 8.2 16.4
0
1
1 65536 states 2.7 3.3
4.1 5.0 6.6 8.2 10.9 16.4 32.8
0 131072 states 5.5 6.6 8.2 10.1 13.1 16.4 21.8 32.8 65.5 0
1 262144 states
10.9 13.1 16.4 20.2 26.2 32.8 43.6 65.6 131.2
1
1 0 2048 states 0.09 0.1 0.13 0.16 0.2 0.3 0.3 0.5 1.0
ms
1 16 states 0.7 0.8 1.0 1.2 1.6 2.0 1.7 4.0 8.0 µs
Notes: 1. Only in H8S/2215R and H8S/2215C.
2. Only in H8S/2215R, H8S/2215T and H8S/2215C.
: Recommended time setting (See the t
OSC2
item in table 24.4 or table 25.4, for conditions)