38K2 Datasheet, PDF (32/151 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

38K2 Group
USB Related Registers
The USB related registers are shown below.
b7
b0
USB control register (USBCON) [address 001016]
Bit symbol
WKUP
TRONCON
TRONE
VREFCON
VREFE
USBDIFE
UCLKCON
USBE
Bit name
Function
Remote wakeup bit
0 : Returning to BUS idle state by writing “1” first and
then “0”. (Remote wakeup signal)
1 : K-state output
TrON output control bit
0 : “L” output mode (valid in TRONE = “1”)
1 : “H” output mode (valid in TRONE = “1”)
TrON output enable bit
0 : TrON port output disabled (Hi-Z state)
1 : TrON port output enabled
USB reference voltage control bit 0 : Normal mode (valid in VREFE = “1”)
1 : Low current mode (valid in VREFE = “1”)
USB reference voltage enable bit 0 : USB reference voltage circuit operation disabled
1 : USB reference voltage circuit operation enabled
USB difference input enable bit 0 : Upstream-port difference input circuit operation disabled
1 : Upstream--port difference input circuit operation enabled
USB clock select bit
0 : External oscillating clock f(XIN)
1 : PLL circuit output clock (fVCO)
USB module operation enable bit 0 : USB module reset
1 : USB module operation enabled
At reset
H/W S/W
RW
0 – OO
0 – OO
0 – OO
0 – OO
0 – OO
0 – OO
0 – OO
0 – OO
–: State remaining
Fig. 31 Structure of USB control register
b7
0 00000
b0
USB function/HUB enable register (USBAE) [address 001116]
Bit symbol
Bit name
AD0E
USB function enable bit
AD1E
USB HUB enable bit
b7:b2
Not used
Function
0: USB function address register invalidated
1: USB function address register validated
0: USB HUB address register invalidated
1: USB HUB address register validated
Write “0” when writing.
“0” is read when reading.
Fig. 32 Structure of USB function/HUB enable register
At reset
RW
H/W S/W
0 – OO
0 – OO
– – OO
–: State remaining
Rev.3.00 Oct 15, 2006 page 32 of 147
REJ03B0193-0300