h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 648

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 18 Universal Serial Bus Interface (USB)
Legend:
X: Don’t care
Rev. 3.00 Jan 25, 2006 page 596 of 872
REJ09B0286-0300
Bit
7, 6
5
4
3
2
1
0
Bit Name Initial Value R/W
—
PFSEL2
CKSEL2
CKSEL1
CKSEL0
PFSEL1
PFSEL0
All 0
0
0
0
0
0
1
R
R/W
R/W
R/W
R/W
R/W
R/W
Description
Reserved
These bits are always read as 0 and cannot be modified.
PLL Frequency Select 2
Combined with the PFSEL1 and PFSEL0 bits, this bit
selects the frequency of the clock to be provided to the
USB operating clock generation circuit (PLL).
For details, refer to the description of the PFSEL1 and
PFSEL0 bits.
Clock Source Select 2 to 0
These bits select the source of the clock to be provided
to the USB operating clock generation circuit (PLL).
0XX: PLL stops operation and no clock is input to the
100: Setting prohibited
101: PLL stops operation and the USEXCL pin input (48
110: PLL operates using the system clock generator
111: PLL operates using the USEXCL pin input as a
PLL Frequency Select 1 and 0
The PFSEL2 to PFSEL0 bits select the frequency of the
clock to be provided to the USB operating clock
generation circuit (PLL).
The PLL circuit generates a 48-MHz USB operating
clock based on the clock source whose frequency is
specified by the PFSEL1 and PFSEL2 bits.
000: PLL input clock frequency is 8 MHz
001: PLL input clock frequency is 12 MHz
010: PLL input clock frequency is 16 MHz
011: PLL input clock frequency is 20 MHz
100: PLL input clock frequency is 24 MHz
Other than above: Setting prohibited
PLL.
MHz) is directly used instead of PLL output.
(XTAL) as a clock source.
clock source.