AT90USB646 datasheet(445/459 Pages) ATMEL

Part #	AT90USB646

Description	8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	459 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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445 / 459 page

445

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

Problem Fix/workaround

No known workaround, enable ATmega32U6/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 sof t w a r e w o r k a r ou nd is t o wa it w i th p e r f or m i ng t he sle e p inst r u ctio n un til

TCNT2>OCR2+1.

AT90USB646 Datasheet(PDF) 445 Page - ATMEL Corporation