PIC18F2455_09 Datasheet, PDF (173/438 Pages) Microchip Technology – 28/40/44-Pin,High-Performance,Enhanced Flash,USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
REGISTER 17-3: USTAT: USB STATUS REGISTER
U-0
—
bit 7
R-x
R-x
R-x
R-x
R-x
ENDP3
ENDP2
ENDP1
ENDP0
DIR
R-x
PPBI⁽¹⁾
U-0
—
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6-3
bit 2
bit 1
bit 0
Unimplemented: Read as ‘0’
ENDP3:ENDP0: Encoded Number of Last Endpoint Activity bits
(represents the number of the BDT updated by the last USB transfer)
1111 = Endpoint 15
1110 = Endpoint 14
....
0001 = Endpoint 1
0000 = Endpoint 0
DIR: Last BD Direction Indicator bit
1 = The last transaction was an IN token
0 = The last transaction was an OUT or SETUP token
PPBI: Ping-Pong BD Pointer Indicator bit⁽¹⁾
1 = The last transaction was to the Odd BD bank
0 = The last transaction was to the Even BD bank
Unimplemented: Read as ‘0’
Note 1: This bit is only valid for endpoints with available Even and Odd BD registers.
© 2009 Microchip Technology Inc.
DS39632E-page 171