Microchip Technology DM183037 Data Sheet

DS30575A-page 536

 2012 Microchip Technology Inc.

R/W-x

R/W-x

U-0

U-0

R/W-x

R/W-x

R/W-x

R/W-x

UOWN

DTS

—

—

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

0 = The microcontroller core owns the BD and its corresponding buffer

bit 6

DTS: Data Toggle Synchronization bit

1 = Data 1 packet
0 = Data 0 packet

bit 5-4

Unimplemented: These bits should always be programmed to ‘0’

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 is 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 is 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.

This bit must be initialized by the user to the desired value prior to enabling the USB module.

This bit is ignored unless DTSEN = 1.

If these bits are set, USB communication may not work. Hence, these bits should always be maintained as 
‘0’.