AT43USB325 datasheet(82/109 Pages) ATMEL

82 / 109 page

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

$1FFB

–

KB INT EN

–

SUSP FLG

RESUME FLG

RMWUPE

CONFG

HADD EN

GLB_STATE

Read/Write

R/W

Initial Value

AT43USB325 데이터시트(PDF) 82 Page - ATMEL Corporation

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