AT90USB647-AU Atmel, AT90USB647-AU Datasheet - Page 32

• Manufacturer Part Number: AT90USB647-AU
• Description: MCU, 8BIT, AVR, 64K FLASH, USB, 64TQFP
• Manufacturer: Atmel

Specifications of AT90USB647-AU

• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Controller Family/series: AVR USB
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Details

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.
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 mode again it may wake up several times.
Problem Fix/workaround
A s o f t w a r e w o r k a r o u n d i s t o w a i t w i t h p e r f o r m i n g t h e s l e e p i n s t r u c t i o n u n t i l
TCNT2>OCR2+1.
AT90USB64/128
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7593KS–AVR–11/09