HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 540

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

18.3
Register configuration of the USB pin multiplexer controller is described below. See section 27,
List of Registers, for the addresses of this register and the state of it in each processing status.
• EXCPG control register (EXCPGCR)
18.3.1
EXCPGCR controls providing a 48-MHz clock to the USB host controller and USB function
controller and performs module reset.
Rev. 1.00, 02/04, page 502 of 804
Bit
7 to 5 
4
Bit Name
USBVALID 0
EXCPG Control Register (EXCPGCR)
Register Description
Initial
Value
All 0
R/W
R
R
Descriptions
Reserved
These bits are always read as 0. The write value should
always be 0. If 1 is written to these bits, correct operation
cannot be guaranteed.
USB Status
The USB module status bit that Indicates whether the
USB module (both the USB host and USB function
controllers) can be used or not. This bit is a read-only
bit. A write access to this bit is ignored. Immediately
after power-on reset of the USB module, immediately
returning from the software standby, or immediately after
reset by USBRESET, the USB module cannot be used
for a short time. Before using the USB module, check
this bit status.
Note: Even if the USBHSTP and USBFSTP bits are set,
0: USB module cannot be used.
1: USB module can be used.
the on-chip multiplier circuit does not stop and this
bit remains set to 1.