AT43USB353M datasheet(78/95 Pages) ATMEL

78 / 95 page

AT43USB353M

3307B–USB–4/04

• Bit 0 – PCSTAT: Port Connect Status

0 = No device on this port

1 = Device present on this port

Set to 1 for Port 1. Set and cleared by the hardware after sampling of connect status at EOF2.

Overcurrent Detect Register – UOVCER

Bits 3, 2 in this register enable overcurrent detection while the hub is in the suspend state.

• Bit 7..4

– Reserved

These bits are reserved in the AT43USB353M and will read as zero.

•Bit 3

– OVC3

Setting this bit enables the hub to detect an overcurrent on a port while the hub is in the sus-

pend state. The overcurrent condition is signaled by a 1 to 0 transition at PD1.

•Bit 2

– OVC2

Setting this bit enables the hub to detect an overcurrent on a port while the hub is in the sus-

pend state. The overcurrent condition is signaled by a 1 to 0 transition at PD0.

• Bit 1..0

– Reserved

These bits are reserved in the AT43USB353M and will read as zero.

Hub Port State Register – HPSTAT2, 3

These registers contain the state of the ports’ DP and DM pins, which will be sent to the host

upon receipt of a GetBusState request.

• Bit 7..2

– Reserved

These bits are reserved in the AT43USB353M and will read as zero.

•Bit 1

– DPSTATE: DPlus State

Value of DP at last EOF. Set and cleared by hardware at EOF2.

Set to 1 for Port 1.

•Bit 0

– DMSTATE: DMinus State

Value of DM at last EOF. Set and cleared by hardware at EOF2.

Set to 0 for Port 1.

Bit

543

$1FF2

–

OVC3

OVC2

–

UOVCER

Read/Write

R/W

Initial Value

Bit

543

Port2 $1FA9

–

DPSTATE

DMSTATE

PSTATE2

Port3 $1FAA

–

DPSTATE

DMSTATE

PSTATE3

Read/Write

Initial Value

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