AT43USB325 datasheet(75/109 Pages) ATMEL

75 / 109 page

3355C–USB–4/05

AT43USB325

8.3.6

Hub Endpoint 0 Byte Count Register – HBYTE_CNT0

8.3.7

Function Endpoint 0..3 Byte Count Register – FBYTE_CNT0..3

The contents of these registers stores the number of bytes to be sent or that was received by

USB Hub and Function endpoints. This count includes the 16-bit CRC. To get the actual byte

count of the data, subtract the count in the register by 2. The maximum byte count supported by

the AT43USB325 is 8 bytes. Hub endpoint 1 has no byte count register.

• Bit 7..6 – Reserved

These bits are reserved in the AT43USB325 and will read as zero.

• Bit 5..0 – BYTCT5..0: Byte Count – Length of Endpoint Data Packet

Bit

210

Hub EP0 $1FCF

–

BYTCT5

BYTCT4

BYTCT3

BYTCT2

BYTCT1

BYTCT0

HBYTE_CNT0

Function EP0 $1FCD

–

BYTCT5

BYTCT4

BYTCT3

BYTCT2

BYTCT1

BYTCT0

FBYTE_CNT0

Function EP1 $1FCC

–

BYTCT5

BYTCT4

BYTCT3

BYTCT2

BYTCT1

BYTCT0

FBYTE_CNT1

Function EP2 $1FCB

–

BYTCT5

BYTCT4

BYTCT3

BYTCT2

BYTCT1

BYTCT0

FBYTE_CNT2

Function EP3 $1FCA

–

BYTCT5

BYTCT4

BYTCT3

BYTCT2

BYTCT1

BYTCT0

FBYTE_CNT3

Read/Write

R/W

Initial Value

AT43USB325 Datasheet(PDF) 75 Page - ATMEL Corporation

AT43USB325 Datasheet(HTML) 75 Page - ATMEL Corporation

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