h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 646

• 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)
USBCR1
Rev. 3.00 Jan 25, 2006 page 594 of 872
REJ09B0286-0300
Bit
7 to
2
1
0
Bit Name Initial Value R/W
—
VBUSS
CK48-
READY
All 0
0
0
R
R/W
R/W
Description
Reserved
These bits are always read as 0 and cannot be modified.
VBUS Status
Prevents bus driver/receiver feedthrough current from
generating by controlling the VBUS line (USB cable)
connection state. The VBUS status monitor circuit must
be designed by using the external interrupt and general
ports. In addition, external pull-up resistors must be
turned ON or OFF by using the general ports.
0: Prevents feedthrough current from generating by
1: VBUS connection.
CK48READY
Controls the bus clock (48 MHz) supply to the USB
function core. To stop or start up the PLL operation
correctly in suspend or resume state, the bus clock
supply must be stopped before stopping the PLL circuit,
and the bus clock supply must be restarted after the PLL
operation is stabilized.
0: Disables the bus clock supply to the USB function core
1: Enables the bus clock supply to the USB function core
The USDP and USDM pins are pulled up and pulled
down, respectively.
disconnecting VBUS.
The USDP and USDM pins are placed in high-
impedance state.