at43usb320a ATMEL Corporation, at43usb320a Datasheet - Page 80

• Manufacturer Part Number: at43usb320a
• Description: Full-speed Usb Microcontroller With An Embedded Hub
• Manufacturer: ATMEL Corporation

80
AT43USB320A
Hub Endpoint 0 Data Register – HDR0
Function Endpoint 0..2 Data Register – FDR0..2
This register is used to read data from or to write data to the Hub Endpoint 0 FIFO.
• Bit 7..0 – FDAT7..0: FIFO Data
Hub endpoint 1 has a single byte data register instead of a FIFO. This data register contains
the hub and port status change bitmap. This data register is automatically updated by the USB
hardware and is not accessible by the firmware. The bits in this register when read by the host
will be:
• Bit 7, 6 – Reserved
These bits are reserved in the AT43USB320A and will read as zero.
• Bit 5 – P5 SC: Port 5 Status Change
• Bit 4 – P4 SC: Port 4Status Change
• Bit 3 – P3 SC: Port 3 Status Change
• Bit 2 – P2 SC: Port 2 Status Change
• Bit 1 – P1 SC: Port 1 Status Change
• Bit 0 – H SC: Hub Status Change
Initial Value
Read/Write
Initial Value
Read/Write
$1FD7
$1FD5
$1FD4
$1FD3
Bit
Bit
$
DATA7
DATA7
DATA7
DATA7
R/W
R/W
7
0
7
–
0
DATA6
DATA6
DATA6
DATA6
R/W
R/W
6
0
6
–
0
DATA5
DATA5
DATA5
DATA5
P5 SC
R/W
R/W
5
0
5
0
DATA4
DATA4
DATA4
DATA4
P4 SC
R/W
R/W
4
0
4
0
DATA3
DATA3
DATA3
DATA3
P3 SC
R/W
R/W
3
0
3
0
DATA2
DATA2
DATA2
DATA2
P2 SC
R/W
R/W
2
0
2
0
DATA1
DATA1
DATA1
DATA1
P1 SC
R/W
R/W
1
0
1
0
DATA0
DATA0
DATA0
DATA0
H SC
R/W
R/W
1443E–USB–4/04
0
0
0
0
HDR0
FDR0
FDR1
FDR2
HDR1