38K2 datasheet(239/358 Pages) RENESAS

239 / 358 page

2.12 Clock generating circuit

Rev.2.00

Oct 15, 2006

page 90 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

2.12 Clock generating circuit

This paragraph explains the registers setting method and the notes related to the clock generating circuit.

2.12.1 Memory map

Fig. 2.12.2 Structure of USB control register

2.12.2 Related registers

CPU mode register (CPUM)

USB control register (USBCON)

003B16

001016

0FF816

PLL control register (PLLCON)

Fig. 2.12.1 Memory map of registers related to clock generating circuit

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

USB control register

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

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

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

and then “0”. (Remote wakeup signal)

1 : K-state output

USB control register (USBCON)

[Address 1016]

38K2 Datasheet(PDF) 239 Page - Renesas Technology Corp

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