Rev. 3.0, 10/02, page 617 of 686
Table 22.3
Oscillation Stabilization Time Settings
STS2 STS1 STS0 Standby Time
16
MHz
13
MHz
10
MHz
8
MHz
6
MHz
4
MHz
2
MHz Unit
0
8192 states
0.51
0.6
0.8
1.0
1.3
2.0
4.1
0
1
16384 states
1.0
1.3
1.6
2.0
2.7
4.1
8.2
0
32768 states
2.0
2.5
3.3
4.1
5.5
8.2
16.4
0
1
1
65536 states
4.1
5.0
6.6
8.2
10.9
16.4
32.8
0
131072 states
8.2
10.1
13.1
16.4
21.8
32.8
65.5
0
1
262144 states
16.4
20.2
26.2
32.8
43.6
65.6
131.2
0
2048 states
0.13
0.16
0.2
0.3
0.3
0.5
1.0
ms
1
1
1
16 states
1.0
1.2
1.6
2.0
1.7
4.0
8.0
µs
: Recommended time setting
22.4.4
Software Standby Mode Application Example
Figure 22.3 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.
Software standby mode is then cleared at the rising edge on the NMI pin.
Summary of Contents for H8S/2215 Series
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