HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 587

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Bit 6—Reserved: This bit can be read or written to, but only 0 should be written.
Bits 5 to 3—Reserved: Read-only bits, always read as 0.
Bits 2 to 0—System Clock Select 2 to 0 (SCK2 to SCK0): These bits select the clock for the bus
master.
17.2.2
LPWCR is an 8-bit readable/writable register that controls the oscillator's built-in feedback
resistor when using external clock input.
LPWCR is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 6 and 7—Reserved: These bits can be read or written to, but do not affect operation.
Bit 5—Built-in Feedback Resistor Control (RFCUT): Selects whether the oscillator's built-in
feedback resistor and duty adjustment circuit are used with external clock input. Do not access this
bit when a crystal oscillator is used.
When an external clock is input, a temporary transition should be made to software standby mode
after setting this bit. When software standby mode is entered, it is possible to select use or non-use
Bit 2
SCK2
0
1
Bit
Initial value
R/W
Low Power Control Register (LPWCR)
Bit 1
SCK1
0
1
0
1
:
:
:
R/W
Bit 0
SCK0
0
1
0
1
0
1
—
—
7
0
R/W
Description
Bus master is in high-speed mode
Medium-speed clock is /2
Medium-speed clock is /4
Medium-speed clock is /8
Medium-speed clock is /16
Medium-speed clock is /32
—
—
6
0
RFCUT
R/W
5
0
R/W
—
4
0
Rev.3.00 Mar. 26, 2007 Page 545 of 772
R/W
—
3
0
Section 17 Clock Pulse Generator
R/W
—
2
0
R/W
REJ09B0355-0300
—
1
0
(Initial value)
R/W
—
0
0