USB3320 datasheet(54/70 Pages) MICROCHIP

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USB3320

DS00001792B-page 54

 2014-2015 Microchip Technology Inc.

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 and USB Audio functions.

7.1.2.1

Carkit Control

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

This register is used to program the USB3320 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.

If using USB UART mode the UART data will appear at the SPK_L and SPK_R pins if the corresponding SpkLeftEn,

SpkRightEn

, or MicEn switches are enabled.

If using USB Audio the TxdEn and RxdEn bits should not be set when the SpkLeftEn, SpkRightEn, or MicEn switches

are enabled. The USB single-ended receivers described in Section 5.2.1 are disabled when either SpkLeftEn,

SpkRightEn

, or MicEn are set.

7.1.2.2

Carkit Interrupt Enable

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

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

transceiver 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

SpkLeftEn

rd/w/s/c

Connects DM pin to SPK_L pin

SpkRightEn

rd/w/s/c

Connects DP pin to SPK_R pin. See Note below.

MicEn

rd/w/s/c

Connects DP pin to SPK_R pin. See Note below.

Reserved

Read only, 0.

Note:

If SpkRightEn or MicEn are asserted the DP pin will be connected to SPK_R. To disconnect the DP pin

from the SPK_R pin both SpkrRightEn and MicEn must be set to de-asserted.

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.

CarIntDet

Not Implemented. Reads as 0b.

CarDpRise

Not Implemented. Reads as 0b.

CarDpFall

Not Implemented. Reads as 0b.

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