HD6432621 Hitachi, HD6432621 Datasheet - Page 925

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

SCKCR—System Clock Control Register
Bit
Initial value
Read/Write
ø clock output control
Note: * Subclock functions (subactive mode, subsleep mode, and watch mode) and
PSTOP
0
1
:
:
:
direct transition are not available in the H8S/2623 Series, but are available
in the H8S/2626 Series.
Medium-Speed Mode,
PSTOP
High-Speed Mode,
Sub-Active Mode*
R/W
7
0
Fixed high
ø output
—
—
6
0
—
—
Sub-Sleep Mode*
5
0
Frequency multiplication factor switching mode select
0 Specified multiplication factor is valid after
1
Sleep Mode,
Fixed high
ø output
transition to software standby mode
Specified multiplication factor is valid immediately
after STC bits are rewritten
H'FDE6
Bus master clock select
0
1
—
—
4
0
0
1
0
1
—
0
1
0
1
1
1
STCS
Clock Pulse Generator, Power-Down
R/W
Direct Transition*
Bus master is in high-speed mode
Medium-speed clock is ø/2
Medium-speed clock is ø/4
Medium-speed clock is ø/8
Medium-speed clock is ø/16
Medium-speed clock is ø/32
—
3
0
Standby Mode,
Watch Mode*,
Fixed high
Fixed high
Software
SCK2
R/W
2
0
SCK1
High impedance
High impedance
R/W
Standby Mode
1
0
Hardware
SCK0
R/W
0
0
881