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H8S2245 데이터시트(PDF) 607 Page - Renesas Technology Corp

부품명 H8S2245
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 18 Power-Down Modes
Rev.3.00 Mar. 26, 2007 Page 565 of 772
REJ09B0355-0300
18.6.3
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 8 ms (the oscillation stabilization time).
Table 18.4 shows the standby times for different operating frequencies and settings of bits STS2 to
STS0.
Table 18.4
Oscillation Stabilization Time Settings
STS2 STS1 STS0 Standby Time
20
MHz
16
MHz
12
MHz
10
MHz
8
MHz
6
MHz
4
MHz
2
MHz
Unit
0
0
0
8192 states
0.41
0.51
0.68 0.82
1.0
1.4
2.0
4.1
ms
1
16384 states
0.82
1.0
1.4
1.6
2.0
2.7
4.1
8.2
1
0
32768 states
1.6
2.0
2.7
3.3
4.1
5.5
8.2
16.4
1
65536 states
3.3
4.1
5.5
6.6
8.2
10.9 16.4
32.8
1
0
0
131072 states
6.6
8.2
10.9 13.1 16.4
21.8 32.8
65.5
1
262144 states
13.1
16.4
21.8 26.2
32.8
43.7 65.5
131.1
1
0
Reserved
———
———
——
—
1
16 states
0.8
1.0
1.3
1.6
2.0
2.7
4.0
8.0
µs
: Recommended time setting
Using an External Clock
Any value can be set. Normally, use of the minimum time is recommended.
18.6.4
Software Standby Mode Application Example
Figure 18.2 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, an NMI interrupt is accepted with the NMIEG bit in SYSCR cleared to 0 (falling
edge specification), then the NMIEG bit is set to 1 (rising edge specification), the SSBY bit is set
to 1, and a SLEEP instruction is executed, causing a transition to software standby mode.



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