AT90USB82 datasheet(192/306 Pages) ATMEL

Part #	AT90USB82

Description	8-bit Microcontroller with 8/16K Bytes of ISP Flash

PDF	306 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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192 / 306 page

192

7707D–AVR–07/08

AT90USB82/162

Figure 19-10. Pad behaviour

The SUSPI flag indicated that a suspend state has been detected on the USB bus. This flag

automatically put the USB pad in Idle. The detection of a non-idle event sets the WAKEUPI flag

and wakes-up the USB pad.

Moreover, the pad can also be put in the “idle” mode if the DETACH bit is set. It come back in

the active mode when the DETACH bit is cleared.

19.8

D+/D- Read/write

The level of D+ and D- can be read and written using the UPOE register. The USB controller has

to be enabled to write a value. For read operation, the USB controller can be enabled or

disabled.

Idle mode

Active mode

USBE=1

& DETACH=0

& suspend

USBE=0

| DETACH=1

| suspend

SUSPI

Suspend detected = USB pad power down

Clear Suspend by software

Resume = USB pad wake-up

Clear Resume by software

WAKEUPI

PAD status

Active

Power Down

Active

AT90USB82 Datasheet(PDF) 192 Page - ATMEL Corporation