AT90USB646 datasheet(296/434 Pages) ATMEL

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296

7593A–AVR–02/06

AT90USB64/128

23.7 USB Reset

The USB controller sends a USB Reset when the firmware set the RESET bit. The RSTI bit is

set by hardware when the USB Reset has been sent. This triggers an interrupt if the RSTE has

been set.

When a USB Reset has been sent, all the Pipe configuration and the memory allocation are

reset. The General Host interrupt enable register is left unchanged.

If the bus was previously in suspend mode (SOFEN = 0), the USB controller automatically

switches to the resume mode (HWUPI is set) and the SOFEN bit is set by hardware in order to

generate SOF immediately after the USB Reset.

23.8 Address Setup

Once the Device has answer to the first Host requests with the default address (0), the Host

assigns a new address to the device. The Host controller has to send a USB reset to the device

and perform a SET ADDRESS control request, with the new address to be used by the Device.

This control request ended, the firmware write the new address into the UHADDR register. All

following requests, on every Pipes, will be performed using this new address.

When the Host controller send a USB reset, the UHADDR register is reset by hardware and the

following Host requests will be performed using the default address (0).

23.9 Remote Wake-Up detection

The Host Controller enters in Suspend mode when clearing the SOFEN bit. No more Start Of

Frame is sent on the USB bus and the USB Device enters in Suspend mode 3ms later.

The Device awakes the Host Controller by sending an Upstream Resume (Remote Wake-Up

feature). The Host Controller detects a non-idle state on the USB bus and set the HWUPI bit. If

the non-Idle correspond to an Upstream Resume (K state), the RXRSMI bit is set by hardware.

The firmware has to generate a downstream resume within 1ms and for at least 20ms by setting

the RESUME bit.

Once the downstream Resume has been generated, the SOFEN bit is automatically set by hard-

ware in order to generate SOF immediately after the USB resume.

23.10 USB Pipe Reset

The firmware can reset a Pipe using the pipe reset register. The configuration of the pipe and

the data toggle remains unchanged. Only the bank management and the status bits are reset to

their initial values.

To completely reset a Pipe, the firmware has to disable and then enable the pipe.

23.11 Pipe Data Access

In order to read or to write into the Pipe Fifo, the CPU selects the Pipe number with the UPNUM

Host

Ready

Host

Suspend

SOFE=1

or HWUP=1

SOFE=0

AT90USB646 Datasheet(PDF) 296 Page - ATMEL Corporation

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