USB3370 datasheet(56/75 Pages) MICROCHIP

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USB3370

DS00001915B-page 56

 2012 - 2015 Microchip Technology Inc.

7.1.1.12

Debug

Address = 15h (read only)

7.1.1.13

Scratch Register

Address = 16-18h (read), 16h (write), 17h (set), 18h (clear)

7.1.2

CARKIT CONTROL REGISTERS

The following registers are used to set-up and enable the USB UART functions.

7.1.2.1

Carkit Control

Address = 19-1Bh (read), 19h (write), 1Ah (set), 1Bh (clear)

This register is used to program the USB3370 into and out of the Carkit Mode. When entering the UART mode the Link

must first set the desired TxdEn and the RxdEn bits and then transition to Carkit Mode by setting the CarkitMode bit in

the Interface Control Register. When RxdEn is not set then the DATA[1] pin is held to a logic high.

7.1.2.2

Carkit Interrupt Enable

Address = 1D-1Fh (read), 1Dh (write), 1Eh (set), 1Fh (clear)

Field Name

Bit

Access

Default

Description

Linestate[1:0]

1:0

00b

Contains the current value of Linestate[1:0].

Reserved

7:2

000000b

Read only, 0.

Field Name

Bit

Access

Default

Description

Scratch

7:0

rd/w/s/c

00h

Empty register byte for testing purposes. Software can

read, write, set, and clear this register and the PHY

functionality will not be affected.

Field Name

Bit

Access

Default

Description

CarkitPwr

Read only, 0.

IdGndDrv

rd/w/s/c

Drives ID pin to ground

TxdEn

rd/w/s/c

Connects UART TXD (DATA[0]) to DM

RxdEn

rd/w/s/c

Connects UART RXD (DATA[1]) to DP

Reserved

rd/w/s/c

Reserved

rd/w/s/c

Reserved

rd/w/s/c

CarkitDataMC

rd/w/s/c

When set the UPLI DATA[2] pin is changed from a

driven 0 to tri-state, when carkit mode is entered.

Field Name

Bit

Access

Default

Description

IdFloatRise

rd/w/s/c

When enabled an interrupt will be generated on the

alt_int of the RXCMD byte when the ID pin transitions

from non-floating to floating. The IdPullup bit in the

OTG Control register should be set.

IdFloatFall

rd/w/s/c

When enabled an interrupt will be generated on the

alt_int of the RXCMD byte when the ID pin transitions

from floating to non-floating. The IdPullup bit in the

OTG Control register should be set.

VdatDetIntEn

rd/w/s/c

When enabled an interrupt will be generated on the

alt_int of the RXCMD byte when the VDAT_DET

Comparator changes state.

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