Datasheet

PIC18F/LF1XK50

DS41350E-page 254 Preliminary  2010 Microchip Technology Inc.

R/W-0 U-0 U-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0

UTEYE — — UPUEN

(1)

— FSEN

(1)

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 enabled

0 = Eye pattern test disabled

bit 6-5 Unimplemented: Read as ‘0’

bit 4 UPUEN: USB On-Chip Pull-up Enable bit

(1)

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

0 = On-chip pull-up disabled

bit 3 Unimplemented: Read as ‘0’

bit 2 FSEN: Full-Speed Enable bit

(1)

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 enabled for Endpoints 1 to 15

10 = Even/Odd ping-pong buffers enabled for all endpoints

01 = Even/Odd ping-pong buffer enabled for OUT Endpoint 0

00 = Even/Odd ping-pong buffers disabled

Note 1: The UPUEN, and FSEN bits should never be changed while the USB module is enabled. These values

must be preconfigured prior to enabling the module.