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AT43USB325 Datasheet(PDF) 74 Page - ATMEL Corporation |
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AT43USB325 Datasheet(HTML) 74 Page - ATMEL Corporation |
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74 / 109 page  74 3355C–USB–4/05 AT43USB325 8.3.4 Hub Endpoint 0 Data Register – HDR0 8.3.5 Function Endpoint 0..3 Data Register – FDR0..3 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 hard- ware 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 AT43USB325 and will read as zero. • Bit 5 – P5 SC: Port 5 Status Change • Bit 4 – P4 SC: Port 4 Status 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 Bit 7 6 5 4 3 2 1 0 $1FD7 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 HDR0 $1FD5 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 FDR0 $1FD4 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 FDR1 $1FD3 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 FDR2 $1FD2 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 FDR3 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 5 4 3 2 1 0 $ – – P5 CS P4 CS P3 SC P2 SC P1 SC H SC HDR1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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