at90usb647-16au ATMEL Corporation, at90usb647-16au Datasheet - Page 25

• Manufacturer Part Number: at90usb647-16au
• Description: At90usb1286 8-bit Avr Microcontroller With 64/128k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

AT90USB64/128
Problem Fix/workaround
Before entering sleep, interrupts not used to wake up the part from the sleep mode should
be disabled.
1. 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 s o ft wa r e wo r k ar o un d i s to w ai t wi t h pe r fo r mi n g th e s l ee p i n st r uc t io n u nt i l
TCNT2>OCR2+1.
25
7593GS–AVR–03/08