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AT43USB325E-AC Datasheet(PDF) 82 Page - ATMEL Corporation |
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AT43USB325E-AC Datasheet(HTML) 82 Page - ATMEL Corporation |
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82 / 109 page  82 3355C–USB–4/05 AT43USB325 8.4.1 Hub General Registers 8.4.1.1 Global State Register – GLB_STATE •Bit 7 – Reserved Bit This bit is reserved in the AT43USB325 and will read as zero. •Bit 6 – KB INT EN: Keyboard Interrupt Enable The firmware must set this bit to a 1 before entering suspend to allow remote wakeup when any key depression is detected in the suspended state. •Bit 5 – Reserved Bit This bit is reserved in the AT43USB325 and will read as zero. •Bit 4 – SUSP FLG: Suspend Flag This bit is set to 1 while the USB hardware is in the suspended state. This bit is a firmware read only bit. It is set and cleared by the USB hardware. •Bit 3 – RESUME FLGL Resume Flag When the USB hardware receives a resume signal from the upstream device it sets this bit. This bit will stay set until the USB hardware completes the downstream resume signaling. This bit is a firmware read only bit. It is set and cleared by the USB hardware. •Bit 2 – RMWUPE: Remote Wakeup Enable This bit is set if the host enables the hub's remote wakeup feature. •Bit 1 – CONFG: Configured This bit is set by firmware after a valid SET_CONFIGURATION request is received. It is cleared by a reset or by a SET_CONFIGURATION with a value of 0. •Bit 0 – HADD EN: Hub Address Enabled This bit is set by firmware after the status phase of a SET_ADDRESS request transaction so the hub will use the new address starting at the next transaction. Bit 7 6 5 4 3 2 1 0 $1FFB – KB INT EN – SUSP FLG RESUME FLG RMWUPE CONFG HADD EN GLB_STATE Read/Write R R R R R R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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