Datasheet

 2010 Microchip Technology Inc. Preliminary DS41350E-page 261
PIC18F/LF1XK50
REGISTER 22-5: BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER (BD0STAT THROUGH
BD31STAT), CPU MODE (DATA IS WRITTEN TO THE SIDE)
R/W-x R/W-x U-0 U-0 R/W-x R/W-x R/W-x R/W-x
UOWN
(1)
DTS
(2)
—
(3)
—
(3)
DTSEN BSTALL BC9 BC8
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 UOWN: USB Own bit
(1)
0 = The microcontroller core owns the BD and its corresponding buffer
bit 6 DTS: Data Toggle Synchronization bit
(2)
1 = Data 1 packet
0 = Data 0 packet
bit 5-4 Unimplemented: These bits should always be programmed to ‘0’
(3)
.
bit 3 DTSEN: Data Toggle Synchronization Enable bit
1 = Data toggle synchronization is enabled; data packets with incorrect Sync value will be ignored
except for a SETUP transaction, which is accepted even if the data toggle bits do not match
0 = No data toggle synchronization is performed
bit 2 BSTALL: Buffer Stall Enable bit
1 = Buffer stall enabled; STALL handshake issued if a token is received that would use the BD in the
given location (UOWN bit remains set, BD value is unchanged)
0 = Buffer stall disabled
bit 1-0 BC<9:8>: Byte Count 9 and 8 bits
The byte count bits represent the number of bytes that will be transmitted for an IN token or received
during an OUT token. Together with BC<7:0>, the valid byte counts are 0-1023.
Note 1: This bit must be initialized by the user to the desired value prior to enabling the USB module.
2: This bit is ignored unless DTSEN = 1.
3: If these bits are set, USB communication may not work. Hence, these bits should always be maintained as
‘0’.