Datasheet

PIC16C745/765

DS41124D-page 70 Preliminary  1999-2013 Microchip Technology Inc.

(BDndST: 1A0h, 1A4h, 1A8h, 1ACh, 1B0h, 1B4h)

(BDndBC: 1A1h, 1A5h, 1A9h, 1ADh, 1B1h, 1B5h)

R/W-0 R/W-X R/W-X R/W-X R/W-X R/W-X U-X U-X

UOWN DATA0/1 PID3 PID2 PID1 PID0 — — R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

-n = Value at POR reset

X = Don’t care

bit7 bit0

bit 7: UOWN: USB Own

This UOWN bit determines who currently owns the buffer. The SIE writes a 0 to this bit when it has com-

pleted a token. This byte of the BD should always be the last byte the MCU updates when it initializes a

BD. Once the BD has been assigned to the USB, the MCU should not change it in any way.

1 = USB has exclusive access to the BD. The MCU should not modify the BD or buffer.

0 = The MCU has exclusive access to the BD. The USB ignores all other fields in the BD.

bit 6: DATA0/1: This bit defines the type of data toggle packet that was transmitted or received

1 = Data 1 packet

0 = Data 0 packet

bit 5-2: PID<3:0>: Packet Identifier

The received token PID value.

bit 1-0: Reserved: Read as 'X'

Note: Recommend that users not use BSF, BCF due to the dual functionality of this register.

U-X U-X U-X U-X R/W-X R/W-X R/W-X R/W-X

— — — — BC3 BC2 BC1 BC0 R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

-n = Value at POR reset

X = Don’t care

bit7 bit0

bit 7-4: Reserved: Read as ’X’

bit 3-0: BC<3:0>: The Byte Count bits represent the number of bytes that will be transmitted for an IN TOKEN or

received during an OUT TOKEN. Valid byte counts are 0 - 8. The SIE will change this field upon the com-

pletion of an OUT or SETUP token with the actual byte count of the data received.