r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1208

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 25 Power-Down Modes
Table 25.2 Oscillation Stabilization Time Settings
Note:
(4)
Figure 25.2 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.
In this example, after an NMI interrupt is accepted with the NMIEG bit in INTCR cleared to 0
(falling edge specification), the NMIEG bit is set to 1 (rising edge specification). And after the
SSBY bit is set to 1, a SLEEP instruction is executed, causing a transition to software standby
mode.
Software standby mode is then cleared at the rising edge on the NMI pin.
Rev. 1.00 Sep. 19, 2008 Page 1178 of 1342
REJ09B0467-0100
STS3 STS2 STS1 STS0
0
1
Software Standby Mode Application Example
0
1
0
1
*
φ is the frequency divider output.
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
10.49
20.97
20





3.2
25.6
51.2
102.4
0.20
0.82
1.64
3.28
6.55
13.11
26.21
φ * [MHz]
13





4.9
39.4
78.8
157.5
0.32
1.26
2.52
5.04
10.08
20.16
40.33
10





6.4
51.2
102.4
204.8
0.41
1.64
3.28
6.55
13.11
26.21
52.43
8





8.0
64.0
128.0
256.0
0.51
2.05
4.10
8.19
16.38
32.77
65.54
Unit
µs
ms