USB334X datasheet(75/92 Pages) MICROCHIP

75 / 92 page

 2009-2018 Microchip Technology Inc.

DS00002646A-page 75

USB334x

Note 7-4

rd: Read Only with auto clear.

7.1.3.5

USB IO & Power Management

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

RidConversionStart

rd/w/s/c

When this bit is asserted either through a register

write or set, the Rid converter will read the value of

the ID resistor. When the conversion is complete this

bit will auto clear.

Reserved

rd/w/s/c

This bit must remain at 0.

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 PHY is switched

from USB mode to UART mode regulator output will

automatically change to the value specified in this

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

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