842
23.1.2
Register Configuration
The clock pulse generator is controlled by SCKCR and LPWRCR. Table 23-1 shows the register
configuration.
Table 23-1 Clock Pulse Generator Register
Name
Abbreviation
R/W
Initial Value
Address
*
System clock control register
SCKCR
R/W
H'00
H'FDE6
Low-power control register
LPWRCR
R/W
H'00
H'FDEC
Note:
*
Lower 16 bits of the address.
23.2
Register Descriptions
23.2.1
System Clock Control Register (SCKCR)
7
PSTOP
0
R/W
6
—
0
—
5
—
0
—
4
—
0
—
3
STCS
0
R/W
0
SCK0
0
R/W
2
SCK2
0
R/W
1
SCK1
0
R/W
Bit
Initial value
R/W
:
:
:
SCKCR is an 8-bit readable/writable register that performs ø clock output control, selection of
operation when the PLL circuit frequency multiplication factor is changed, and medium-speed
mode control.
SCKCR is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 7—ø Clock Output Disable (PSTOP): Controls ø output.
Description
Bit 7
PSTOP
High-Speed Mode,
Medium-Speed Mode,
Sub-Active Mode
Sleep Mode
Sub-Sleep Mode
Software
Standby Mode,
Watch Mode
Hardware
Standby Mode
0
ø output (initial value)
ø output
Fixed high
High impedance
1
Fixed high
Fixed high
Fixed high
High impedance
Bits 6 and 4—Reserved: These bits are always read as 0 and cannot be modified.
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...