Section 27 Power-Down Modes
Rev. 3.00 Jan 25, 2006 page 773 of 872
REJ09B0286-0300
Bit
Bit Name Initial Value R/W
Description
6
5
4
STS2
STS1
STS0
0
0
0
R/W
R/W
R/W
Standby Timer Select 2 to 0
Select the wait time for clock stabilization from clock
oscillation start when canceling software standby mode,
watch mode, or subactive mode. Select a wait time of 8 ms
(oscillation stabilization time) or more, depending on the
operating frequency. Table 27.1 shows the relationship
between the STS2 to STS0 values and wait time.
With an external clock, there are no specific wait
requirements. Normally the minimum value is
recommended.
3
DTSPEED 0
R/W
DTC/RFU Speed
Specifies the operating clock for the bus masters (DTC and
RFU) other than the CPU in medium-speed mode.
0: All bus masters operate based on the medium-speed
clock.
1: The DTC/RFU operates based on the system clock.
The operating clock is changed when a DTC/RFU transfer
is requested even if the CPU operates based on the
medium-speed clock. Note however that medium-speed
mode for the RFU is not supported in this LSI. This bit must
be set to 1 when the RFU is used in medium-speed mode.
If the RFU is activated while this bit is cleared to 0, the
program may go wild.
2
1
0
SCK2
SCK1
SCK0
0
0
1
R/W
R/W
R/W
System Clock Select 2 to 0
Select a clock for the bus master in high-speed mode or
medium-speed mode.
When making a transition to subactive mode or watch
mode, the SCK2 to SCK0 bits must be cleared to B’000.
000: High-speed mode
001: Medium-speed clock:
φ
/2 (Initial value)
010: Medium-speed clock:
φ
/4
011: Medium-speed clock:
φ
/8
100: Medium-speed clock:
φ
/16
101: Medium-speed clock:
φ
/32
11X: —
Legend:
X: Don't care
Содержание H8S/2158
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Страница 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Страница 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
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Страница 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Страница 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Страница 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Страница 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
Страница 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Страница 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Страница 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...