Datasheet

 2012 Microchip Technology Inc. DS30684A-page 355
PIC18(L)F2X/45K50
REGISTER 24-2: UCFG: USB CONFIGURATION REGISTER (BANKED F39h)
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
(1,2)
UTRDIS
(1,3)
FSEN
(1)
PPB<1:0>
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
(1,2)
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
(1,3)
1 = On-chip transceiver is disabled
0 = On-chip transceiver is active
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 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
Note 1: 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.
2: This bit is only valid when the on-chip transceiver is active (UTRDIS = 0); otherwise, it is ignored.
3: If UTRDIS is set, the UOE
signal will be active, independent of the UOEMON bit setting.