AT90USB646 datasheet(301/456 Pages) ATMEL

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7593L–AVR–09/12

AT90USB64/128

• 7 - FIFOCON - FIFO Control

For OUT and SETUP Pipe:

Set by hardware when the current bank is free, at the same time than TXOUT or TXSTP.

Clear to send the FIFO data and to switch the bank. Setting by software has no effect.

For IN Pipe:

Set by hardware when a new IN message is stored in the current bank, at the same time than

RXIN.

Clear to free the current bank and to switch to the following bank. Setting by software has no

effect.

• 6 - NAKEDI - NAK Handshake received

Set by hardware when a NAK has been received on the current bank of the Pipe. This triggers

an interrupt if the NAKEDE bit is set in the UPIENX register.

Shall be clear to handshake the interrupt. Setting by software has no effect.

• 5 - RWAL - Read/Write Allowed

OUT Pipe:

Set by hardware when the firmware can write a new data into the Pipe FIFO.

Cleared by hardware when the current Pipe FIFO is full.

IN Pipe:

Set by hardware when the firmware can read a new data into the Pipe FIFO.

Cleared by hardware when the current Pipe FIFO is empty.

This bit is also cleared by hardware when the RXSTALL or the PERR bit is set

• 4 - PERRI -PIPE Error

Set by hardware when an error occurs on the current bank of the Pipe. This triggers an interrupt

if the PERRE bit is set in the UPIENX register. Refers to the UPERRX register to determine the

source of the error.

Automatically cleared by hardware when the error source bit is cleared.

• 3 - TXSTPI - SETUP Bank ready

Set by hardware when the current SETUP bank is free and can be filled. This triggers an inter-

rupt if the TXSTPE bit is set in the UPIENX register.

Shall be cleared to handshake the interrupt. Setting by software has no effect.

• 2 - TXOUTI -OUT Bank ready

Set by hardware when the current OUT bank is free and can be filled. This triggers an interrupt if

the TXOUTE bit is set in the UPIENX register.

Shall be cleared to handshake the interrupt. Setting by software has no effect.

Bit

FIFOCON

NAKEDI

RWAL

PERRI

TXSTPI

TXOUTI

RXSTALLI

RXINI

UPINTX

Read/write

Initial value

AT90USB646 Datasheet(PDF) 301 Page - ATMEL Corporation

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