HD6473258CP10 Datasheet, PDF (225/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Bit 6
STS2
0
0
0
0
1
Bit 5
STS1
0
0
1
1
—
Bit 4
STS0
0
1
0
1
—
Description
Settling time = 8192 states
Settling time = 16384 states
Settling time = 32768 states
Settling time = 65536 states
Settling time = 131072 states
(Initial value)
When the on-chip clock generator is used, the STS bits should be set to allow a settling time of at
least 10 ms. Table 12-3 lists the settling times selected by these bits at several clock frequencies
and indicates the recommended settings.
When the chip is externally clocked, the STS bits can be set to any value. The minimum value
(STS2 = STS1 = STS0 = 0) is recommended.
Table 12-3. Times Set by Standby Timer Select Bits (Unit: ms)
STS2
0
0
0
0
1
STS1
0
0
1
1
—
STS0
0
1
0
1
—
Settling
time
(states) 10
8192 0.8
16384 1.6
32768 3.3
65536 6.6
131072 13.1
System clock frequency (MHz)
8
6
4
2
1
1.0 1.4 2.0 4.1 8.2
2.0 2.7 4.1 8.2 16.4
4.1 5.5 8.2 16.4 32.8
8.2 10.9 16.4 32.8 65.5
16.4 21.8 32.8 65.5 131.1
0.5
16.4
32.8
65.5
131.1
262.1
Notes:
1. All times are in milliseconds.
2. Recommended values are printed in boldface.
12.3 Sleep Mode
The sleep mode provides an effective way to conserve power while the CPU is waiting for an
external interrupt or an interrupt from an on-chip supporting module.
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