USB334X datasheet(70/92 Pages) MICROCHIP

70 / 92 page

USB334x

DS00002646A-page 70

 2009-2018 Microchip Technology Inc.

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 USB334x 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, "USB Transceiver," on page 25 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

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.

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.

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.

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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