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AT43USB325 Datasheet(PDF) 71 Page - ATMEL Corporation |
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AT43USB325 Datasheet(HTML) 71 Page - ATMEL Corporation |
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71 / 109 page  71 3355C–USB–4/05 AT43USB325 8.2 USB Registers The following sections describe the registers of the AT43USB325’s USB hub and function units. Reading a bit for which the microcontroller does not have read access will yield a zero value result. Writing to a bit for which the microcontroller does not have write access has no effect. 8.2.1 Hub Address Register – HADDR The USB hub contains an address register that contains the hub address assigned by the host. This Hub Address Register must be programmed by the microcontroller once it has received a SET_ADDRESS request from the host. The USB hardware uses the new address only after the status phase of the transaction is completed when the microcontroller has enabled the new address by setting bit 0 of the Global State Register. After power-up or reset, this register will contain the value of 0x00. 8.2.1.1 Hub Address Register – HADDR • Bit 7 – SAEN: Single Address Enable The Single Address Enable bit allows the microcontroller to configure the AT43USB325 into a single address or a composite device. Once this capability is enabled, the hub endpoint 0 (HEP0) is converted from a control endpoint to a programmable function endpoint FEP3; all the endpoints would then operate on the single address. • Bit 6..0 – HADD6...0: Hub Address[6:0] 8.2.2 Function Address Register – FADDR The USB function contains an address register that contains the function address assigned by the host. This Function Address Register must be programmed by the microcontroller once it has received a SET_ADDRESS request from the host and completed the status phase of the transaction. After power up or reset, this register will contain the value of 0x00. 8.2.2.1 Function Address Register – FADDR • Bit 7 – FEN: Function Enable The Function Enable bit (FEN) allows the firmware to enable or disable the function endpoints. The firmware will set this bit after receipt of a reset through the hub, SetPortFea- ture[PORT_RESET]. Once this bit is set, the USB hardware passes to and from the host. When the Single Address bit is set, the condition of FEN is ignored. • Bit 6..0 – FADD6...0: Function Address[6:0] Bit 7 6 5 4 3 2 1 0 $1FEF SAEN HADD6 HADD5 HADD4 HADD3 HADD2 HADD1 HADD0 HADDR 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 $1FEE FEN FADD6 FADD5 FADD4 FADD3 FADD2 FADD1 FADD0 FADDR 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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