HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 896

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

21.6.3
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 21.4 shows the standby times for different operating frequencies and settings of bits STS2 to
STS0.
Table 21.4 Oscillation Stabilization Time Settings
STS2 STS1 STS0 Standby Time
0
1
Using an External Clock: Any value can be set. Normally, use of the minimum time is
recommended. *
Note: * The 16-state standby time cannot be used in the F-ZTAT versions; a standby time of 8192
21.6.4
Figure 21.2 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.
Rev.4.00 Sep. 07, 2007 Page 866 of 1210
REJ09B0245-0400
: Recommended time setting
0
1
0
1
states or longer should be used.
Setting Oscillation Stabilization Time after Clearing Software Standby Mode
Software Standby Mode Application Example
0
1
0
1
0
1
0
1
8192 states
16384 states
32768 states
65536 states
131072 states 5.2
262144 states 10.4
16 states
Reserved
25
MHz
0.32
0.65
1.3
2.6
—
0.6
20
MHz
0.41
0.82
1.6
3.3
6.6
—
0.8
13.1 16.4 21.8 26.2 32.8 43.6 65.6 131.2
16
MHz
0.51 0.68 0.8
1.0
2.0
4.1
—
1.0
8.2
12
MHz
1.3
2.7
5.5
—
1.3
10.9 13.1 16.4 21.8 32.8 65.5
10
MHz
1.6
3.3
6.6
—
1.6
8
MHz
1.0
2.0
4.1
—
2.0
8.2
6
MHz
1.3
2.7
5.5
2.7
—
10.9 16.4 32.8
4
MHz
2.0
4.1
—
4.0
8.2 16.4
2
MHz
4.1
8.0
—
8.2
Unit
ms
—
µs