h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 1002

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 22B Clock Pulse Generator (H8S/2639 Group, H8S/2635 Group)
22B.1.2 Register Configuration
The clock pulse generator is controlled by SCKCR and LPWRCR. Table 22B-1 shows the register
configuration.
Table 22B-1 Clock Pulse Generator Register
Note:* Lower 16 bits of the address.
22B.2 Register Descriptions
22B.2.1 System Clock Control Register (SCKCR)
SCKCR is an 8-bit readable/writable register that performs 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— Clock Output Disable (PSTOP): In combination with the DDR of the applicable port,
this bit controls output. See section 23B.12, Clock Output Disable Function for details.
Bit 7
PSTOP
0
1
Bits 6 to 4—Reserved: These bits are always read as 0 and cannot be modified.
Rev. 6.00 Feb 22, 2005 page 942 of 1484
REJ09B0103-0600
Name
System clock control register
Low-power control register
Normal Operating
State
Fixed high
output (initial value)
¾
¾
Abbreviation
SCKCR
LPWRCR
Sleep Mode
Fixed high
output
¾
¾
Description
¾
¾
R/W
R/W
R/W
Software
Standby Mode
Fixed high
Fixed high
Initial Value
H'00
H'00
Hardware
Standby Mode
High impedance
High impedance
Address*
H'FDE6
H'FDEC