106
Table 5-4
Clock Frequency and Settling Time (times are in ms)
STS2
STS1
STS0
Waiting Time
5 MHz
2 MHz
1 MHz
0
0
0
8,192 states
1.6384
4.096
8.192
0
0
1
16,384 states
3.2768
8.192
16.384
0
1
0
1,024 states
0.2048
0.512
1.024
0
1
1
2,048 states
0.4096
1.024
2.048
1
0
0
4,096 states
0.8192
2.048
4.096
1
0
1
2 states (not available)
0.0004
0.001
0.002
1
1
0
8 states
0.0016
0.004
0.008
1
1
1
16 states
0.0032
0.008
0.016
•
When an external clock is used
STS2 = 1, STS1 = 0 and STS0 = 1 are recommended. Other values can be set, but with other
settings, operation may start before the standby time is over.
5.3.4
Standby Mode Transition and Pin States
When a SLEEP instruction is executed in active (high-speed) mode or active (medium-speed)
mode while bit SSBY is set to 1 and bit LSON is cleared to 0 in SYSCR1, and bit TMA3 is
cleared to 0 in TMA, a transition is made to standby mode. At the same time, pins go to the high-
impedance state (except pins for which the pull-up MOS is designated as on). Figure 5-2 shows
the timing in this case.
SLEEP instruction fetch
Internal data bus
Fetch of next instruction
Port output
Pins
High-impedance
Active (high-speed) mode or active (medium-speed) mode
Standby mode
SLEEP instruction execution
Internal processing
ø
Figure 5-2 Standby Mode Transition and Pin States
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