38K2 datasheet(32/151 Pages) RENESAS

32 / 151 page

38K2 Group

Rev.3.00

Oct 15, 2006

page 32 of 147

REJ03B0193-0300

USB Related Registers

The USB related registers are shown below.

Fig. 31 Structure of USB control register

Fig. 32 Structure of USB function/HUB enable register

At reset

Function

Bit name

Bit symbol

Remote wakeup bit

TrON output control bit

TrON output enable bit

USB reference voltage control bit

USB reference voltage enable bit

USB difference input enable bit

USB clock select bit

USB module operation enable bit

WKUP

TRONCON

TRONE

VREFCON

VREFE

USBDIFE

UCLKCON

USBE

–

USB control register (USBCON) [address 001016]

–: State remaining

0 : Returning to BUS idle state by writing “1” first and

then “0”. (Remote wakeup signal)

1 : K-state output

0 : “L” output mode (valid in TRONE = “1”)

1 : “H” output mode (valid in TRONE = “1”)

0 : TrON port output disabled (Hi-Z state)

1 : TrON port output enabled

0 : Normal mode (valid in VREFE = “1”)

1 : Low current mode (valid in VREFE = “1”)

0 : USB reference voltage circuit operation disabled

1 : USB reference voltage circuit operation enabled

0 : Upstream-port difference input circuit operation disabled

1 : Upstream--port difference input circuit operation enabled

0 : External oscillating clock f(XIN)

1 : PLL circuit output clock (fVCO)

0 : USB module reset

1 : USB module operation enabled

H/W

S/W

Bit name

Bit symbol

USB function enable bit

USB HUB enable bit

Not used

AD0E

AD1E

b7:b2

–

USB function/HUB enable register (USBAE) [address 001116]

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.

At reset

Function

H/W

S/W

–: State remaining

000

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