AT90USB647-16MU Atmel, AT90USB647-16MU Datasheet - Page 25

• Manufacturer Part Number: AT90USB647-16MU
• Description: Microcontrollers (MCU) AVR USB OTG 64K FLASH IND 5V
• Manufacturer: Atmel

Specifications of AT90USB647-16MU

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 64 KB
• Data Ram Size: 4 KB
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-64
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / Rohs Status: Details
• Other names: AT90USB647-MU

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