AT90USB646 datasheet(256/456 Pages) ATMEL

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7593L–AVR–09/12

AT90USB64/128

22.11 ID detection

The ID pin transition is detected thanks to the following architecture:

Figure 22-17. ID detection input block diagram.

The ID pin can be used to detect the USB mode (Peripheral or Host) or software selected. This

allows the UID pin to be used has general purpose I/O even when USB interface is enable.

When the UID pin is selected, by default, (no A-plug or B-plug), the macro is in the Peripheral

mode (internal pull-up). The IDTI interrupt is triggered when a A-plug (Host) is plugged or

unplugged. The interrupt is not triggered when a B-plug (Periph) is plugged or unplugged.

ID detection is independent of USB global interface enable.

22.12 Registers description

22.12.1

USB general registers

• 7 – UIMOD: USB Mode bit

This bit has no effect when the UIDE bit is set (external UID pin activated). Set to enable the

USB device mode. Clear to enable the USB host mode

• 6 – UIDE: UID pin Enable

Set to enable the USB mode selection (peripheral/host) through the UID pin. Clear to enable the

USB mode selection (peripheral/host) with UIMOD bit register.

UIDE should be modified only when the USB interface is disabled (USBE bit cleared).

• 5 – Reserved

The value read from this bit is always 0. Do not set this bit.

• 4 – UVCONE: UVCON pin Enable

Set to enable the UVCON pin control. Clear to disable the UVCON pin control. This bit should be

set only when the USB interface is enable.

UIMOD

UHWCON.7

UID

USBSTA.1

Internal pull up

VDD

UIDE

UHWCON.6

Bit

321

UIMOD

UIDE

UVCONE

UVREGE

UHWCON

Read/write

R/W

Initial value

AT90USB646 Datasheet(PDF) 256 Page - ATMEL Corporation

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