Datasheet

PIC24FJ256GB110 FAMILY
DS39897C-page 238  2009 Microchip Technology Inc.
18.7.3 USB ENDPOINT MANAGEMENT
REGISTERS
REGISTER 18-21: U1EPn: USB ENDPOINT CONTROL REGISTERS (n = 0 TO 15)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LSPD
(1)
RETRYDIS
(1)
— EPCONDIS EPRXEN EPTXEN EPSTALL EPHSHK
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 15-8 Unimplemented: Read as ‘0’
bit 7 LSPD: Low-Speed Direct Connection Enable bit (U1EP0 only)
(1)
1 = Direct connection to a low-speed device enabled
0 = Direct connection to a low-speed device disabled
bit 6 RETRYDIS: Retry Disable bit (U1EP0 only)
(1)
1 = Retry NAK transactions disabled
0 = Retry NAK transactions enabled; retry done in hardware
bit 5 Unimplemented: Read as ‘0’
bit 4 EPCONDIS: Bidirectional Endpoint Control bit
If EPTXEN and EPRXEN =
1:
1 = Disable Endpoint n from Control transfers; only Tx and Rx transfers allowed
0 = Enable Endpoint n for Control (SETUP) transfers; Tx and Rx transfers also allowed.
For all other combinations of EPTXEN and EPRXEN:
This bit is ignored.
bit 3 EPRXEN: Endpoint Receive Enable bit
1 = Endpoint n receive enabled
0 = Endpoint n receive disabled
bit 2 EPTXEN: Endpoint Transmit Enable bit
1 = Endpoint n transmit enabled
0 = Endpoint n transmit disabled
bit 1 EPSTALL: Endpoint Stall Status bit
1 = Endpoint n was stalled
0 = Endpoint n was not stalled
bit 0 EPHSHK: Endpoint Handshake Enable bit
1 = Endpoint handshake enabled
0 = Endpoint handshake disabled (typically used for isochronous endpoints)
Note 1: These bits are available only for U1EP0, and only in Host mode. For all other U1EPn registers, these bits
are always unimplemented and read as ‘0’.