USB3320 datasheet(57/70 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001792B-page 57

USB3320

Note 7-4

rd: Read Only with auto clear.

7.1.3.4

USB IO & Power Management

Address = 39-3Bh (read), 39h (write), 3Ah (set), 3Bh (clear)

RidIntEn

rd/w/s/c

When enabled an interrupt will be generated on the

alt_int of the RXCMD byte when RidConversionDone

bit is asserted.

Note:

This register bit is or’ed with the RidIntEn bit

of the Carkit Interrupt Status register.

Reserved

Read only, 0.

Field Name

Bit

Access

Default

Description

Reserved

rd/w/s/c

Read only, 0.

SwapDP/DM

rd/w/s/c

When asserted, the DP and DM pins of the USB

transceiver are swapped. This bit can be used to

prevent crossing the DP/DM traces on the board. In

UART mode, it swaps the routing to the DP and DM

pins. In USB Audio Mode, it does not affect the SPK_L

and SPK_R pins.

UART RegOutput

3:2

rd/w/s/c

01b

Controls the output voltage of the VBAT to VDD33

regulator in UART mode. When the transceiver is

switched from USB mode to UART mode regulator

output will automatically change to the value specified

in this register when TxdEn is asserted.

00: 3.3V

01: 3.0V (default)

10: 2.75V

11: 2.5V

Note:

When in USB Audio Mode the regulator will

remain at 3.3V. When using this register it is

recommended that the Link exit UART mode

by using the RESETB pin.

ChargerPullupEnDP

rd/w/s/c

Enables a Pull-up for USB Charger Detection when set

on the DP pin. (The pull-up is automatically enabled in

UART mode)

ChargerPullupEnDM

rd/w/s/c

Enables a Pull-up for USB Charger Detection when set

on the DM pin. (The pull-up is automatically enabled in

UART mode)

USB RegOutput

7:6

rd/w/s/c

00b

Controls the output voltage of the VBAT to VDD33

regulator in USB mode. When the transceiver is in

Synchronous Mode, Serial Mode, or Low Power Mode,

the regulator output will be the value specified in this

00: 3.3V (default)

01: 3.0V

10: 2.75V

11: 2.5V

Field Name

Bit

Access

Default

Description

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