PIC16C54C-04I/SO【PDF 48/194 页】IC MCU OTP 512X12 18SOIC

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Sheet目录3886

44页 45页 46页 47页 [48页]49页 50页 51页 52页

PIC18F2450/4450

2006 Microchip Technology Inc.

Advance Information

DS39760A-page 139

REGISTER 14-5:

BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER (BD0STAT THROUGH

BD63STAT), CPU MODE (DATA IS WRITTEN TO THE SIDE)

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)

= The microcontroller core owns the BD and its corresponding buffer

bit 6

DTS: Data Toggle Synchronization bit(2)

= Data 1 packet

= Data 0 packet

bit 5-4

Reserved: These bits should always be programmed to ‘0’(3)

bit 3

DTSEN: Data Toggle Synchronization Enable bit

= Data toggle synchronization is enabled; data packets with incorrect Sync value will be ignored

= No data toggle synchronization is performed

bit 2

BSTALL: Buffer Stall Enable bit

= 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)

= Buffer stall disabled

bit 1-0

BC9:BC8: 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’.

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