AT43USB325 datasheet(84/109 Pages) ATMEL

84 / 109 page

3355C–USB–4/05

AT43USB325

8.4.2.2

Hub Port Control Register – HPCON

•Bit 7 – Reserved

This bits is reserved in the AT43USB325 and will read as zero.

• Bit 6..4 – HPCON2..0: Hub Port Control Command

These bits are written by firmware to control the port states upon receipt of a Host request.

Disable Port = ClearPortFeature(PORT_ENABLE)

Action: USB hardware places addressed port in disabled state. Port 1 is placed in disabled

state by firmware.

Enable Port = SetPort Feature(PORT_ENABLE)

Action: USB hardware places addressed port in enabled state. Firmware is responsible for plac-

ing Port 1 in enabled state.

Reset and Enable Port = SetPort Feature(PORT_RESET)

Action: USB hardware drives reset signaling through addressed port. USB hardware and firm-

ware resets their embedded function registers to the default state.

Suspend Port = SetPortFeature(PORT_SUSPEND)

Action: USB hardware places port in idle state and stops propagating traffic through the

addressed port. Firmware places Port 1 in suspend state by disabling its endpoints and placing

the peripheral function in its low power state.

Resume Port = ClearPortFeature(PORT_SUSPEND)

Action: USB hardware sends resume signaling to addressed port and then enables port. Firm-

ware takes the embedded function out of the suspend state and enables Port 1's endpoints.

•Bit 3 – Reserved

This bits is reserved in the AT43USB325 and will read as zero.

• Bit 2..0 – HPCON2..0: Hub Port Address

Bit

654

$1FC5

–

HPCON2

HPCON1

HPCON0

–

HPADD2

HPADD1

HPADD0

HPCON

Read/Write

R/W

Initial Value

Bit6

Bit5

Bit4

Action

Disable port

Enable port

Reset and enable port

Suspend port

Resume port

AT43USB325 Datasheet(PDF) 84 Page - ATMEL Corporation

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