AT90USB1287 datasheet(29/35 Pages) ATMEL

Part #	AT90USB1287

Description	Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	35 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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29 / 35 page

7593KS–AVR–11/09

AT90USB64/128

Problem Fix/workaround

No known workaround, enable AT90USB64/128 TWI first versus the others nodes of the

TWI network.

High current consumption in sleep mode

If a pending interrupt cannot wake the part up from the selected mode, the current consump-

tion will increase during sleep when executing the SLEEP instruction directly after a SEI

instruction.

Problem Fix/workaround

Before entering sleep, interrupts not used to wake up the part from the sleep mode should

be disabled.

Asynchronous timer interrupt wake up from sleep generates multiple interrupts

If the CPU core is in sleep and wakes-up from an asynchronous timer interrupt and then go

back in sleep again it may wake up multiple times.

Problem Fix/workaround

A software workaround is to wait with performing the sleep instruction until

TCNT2>OCR2+1.

AT90USB1287 Datasheet(PDF) 29 Page - ATMEL Corporation