Microchip Technology DM183037 Data Sheet

 2012 Microchip Technology Inc.

DS30575A-page 529

 

R/W-0

R/W-0

U-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

UTEYE

UOEMON

—

UPUEN

UTRDIS

FSEN

PPB1

PPB0

bit 7

bit 0

Legend:
R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

UTEYE: USB Eye Pattern Test Enable bit
1 = Eye pattern test is enabled
0 = Eye pattern test is disabled

bit 6

UOEMON: USB OE Monitor Enable bit
1  = UOE signal is active, indicating intervals during which the D+/D- lines are driving
0  = UOE signal is inactive

bit 5

Unimplemented: Read as ‘0’

bit 4

UPUEN: USB On-Chip Pull-up Enable bit

1 = On-chip pull-up is enabled (pull-up on D+ with FSEN = 1 or D- with FSEN = 0)
0 = On-chip pull-up is disabled

bit 3

UTRDIS: On-Chip Transceiver Disable bit

1 = On-chip transceiver is disabled
0 = On-chip transceiver is active

bit 2

FSEN: Full-Speed Enable bit

1 = Full-speed device: Controls transceiver edge rates; requires input clock at 48 MHz
0 = Low-speed device: Controls transceiver edge rates; requires input clock at 6 MHz

bit 1-0

PPB<1:0>: Ping-Pong Buffers Configuration bits
11 = Even/Odd ping-pong buffers are enabled for Endpoints 1 to 15
10 = Even/Odd ping-pong buffers are enabled for all endpoints
01 = Even/Odd ping-pong buffer are enabled for OUT Endpoint 0
00 = Even/Odd ping-pong buffers are disabled

The UPUEN, UTRDIS and FSEN bits should never be changed while the USB module is enabled. These 
values must be preconfigured prior to enabling the module.

This bit is only valid when the on-chip transceiver is active (UTRDIS = 0); otherwise, it is ignored.

If UTRDIS is set, the UOE signal will be active, independent of the UOEMON bit setting.