HD6432670 Hitachi, HD6432670 Datasheet - Page 839

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Setting Oscillation Stabilization Time after Clearing Software Standby Mode: Bits STS3 to
STS0 in SBYCR should be set as described below.
Using a Crystal Oscillator:
Set bits STS3 to STS0 so that the standby time is more than the oscillation stabilization time.
Table 22.2 shows the standby times for operating frequencies and settings of bits STS3 to STS0.
Using an External Clock:
A PLL circuit stabilization time is necessary. Refer to table 22.2 to set the wait time.
Table 22.2 Oscillation Stabilization Time Settings
Note: ø is the frequency divider output.
Software Standby Mode Application Example: Figure 22.2 shows an example in which a
transition is made to software standby mode at the falling edge on the NMI pin, and software
standby mode is cleared at the rising edge on the NMI pin.
STS3 STS2 STS1 STS0
0
1
:
0
1
0
1
Recommended time setting
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Standby
Time
Reserved
Reserved
Reserved
Reserved
Reserved
64
512
1024
2048
4096
16384
32765
65536
131072
262144
524288
33
—
—
—
—
—
1.9
15.5
31.0
62.1
0.12
0.50
0.99
1.99
3.97
7.94
15.89
25
—
—
—
—
—
2.6
20.5
41.0
81.9
0.16
0.66
1.31
2.62
5.24
20.97
10.49
20
—
—
—
3.2
25.6
51.2
102.4
0.20
0.82
1.64
3.28
6.55
26.21
—
—
13.11
ø* [MHz]
39.4
13
—
—
—
—
—
4.9
78.8
157.5
0.32
1.26
2.52
5.04
20.16
40.33
10.08
10
—
—
—
—
—
6.4
51.2
102.4
204.8
0.41
1.64
3.28
6.55
26.21
52.43
13.11
Rev. 2.0, 04/02, page 793 of 906
8
—
—
—
—
—
8.0
64.0
128.0
256.0
0.51
2.05
4.10
16.38
32.77
65.54
8.19
Unit
µs
ms