716
21.1.2
Register Configuration
The clock pulse generator is controlled by SCKCR and LPWRCR. Table 21-1 shows the register
configuration.
Table 21-1 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.
21.2
Register Descriptions
21.2.1
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 and medium-
speed mode 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.
Bit 7
Description
PSTOP
High Speed Mode,
Medium Speed Mode,
Sub-Active Mode
Sleep Mode,
Sub-Sleep Mode
Software Standby
Mode, Watch Mode,
and Direct Transition
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 to 4—Reserved: These bits are always read as 0 and cannot be modified.
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