PIC16F1459-ESSQTP datasheet(330/418 Pages) MICROCHIP

330 / 418 page

PIC16(L)F1454/5/9

DS41639A-page 330

Preliminary

 2012 Microchip Technology Inc.

BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER (BD0STAT THROUGH

BD31STAT), CPU MODE (DATA IS WRITTEN TO THE SIDE)

R/W-x

U-0

R/W-x

UOWN(1)

DTS(2)

—(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)

1 = Refer to Register 26-6.

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:

Read as ‘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 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.

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’.

PIC16F1459-ESSQTP Datasheet(PDF) 330 Page - Microchip Technology

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