Rev. 1.0, 09/02, page 468 of 568
20.1 Register
Descriptions
The on-chip clock pulse generator has the following registers.
•
System clock control register (SCKCR)
•
Low-power control register (LPWRCR)
20.1.1
System Clock Control Register (SCKCR)
SCKCR performs
φ
clock output control, selection of operation when the PLL circuit frequency
multiplication factor is changed, and medium-speed mode control.
Bit
Bit Name
Initial Value
R/W
Description
7 PSTOP
0
R/W
φ
Clock Output Disable
Controls
φ
output.
High-speed Mode, Medium-Speed Mode
0:
φ
output
1: Fixed high
Sleep Mode
0:
φ
output
1: Fixed high
Software Standby Mode
0: Fixed high
1: Fixed high
Hardware Standby Mode
0: High impedance
1: High impedance
6 to
4
All
0
Reserved
These bits are always read as 0.
3
STCS
0
R/W
Frequency Multiplication Factor Switching Mode
Select
Selects the operation when the PLL circuit
frequency multiplication factor is changed.
0: Specified multiplication factor is valid after
transition to software standby mode
1: Specified multiplication factor is valid
immediately after STC1 bit and STC0 bit are
rewritten
Содержание H8S/2627
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