AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 256

• Manufacturer Part Number: AT90USB647-MU
• Description: MCU, 8BIT, 64K FLASH, USB, 64QFN
• Manufacturer: Atmel

Specifications of AT90USB647-MU

• Controller Family/series: AT90
• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Package: 64QFN EP
• Device Core: AVR
• Family Name: AT90
• Maximum Speed: 20 MHz
• Ram Size: 4 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 48
• Interface Type: SPI/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4
• Lead Free Status / Rohs Status: Details

21.5.3
21.6
21.6.1
256
Speed Control
AT90USB64/128
Freeze clock
Device mode
The firmware has the ability to reduce the power consumption by setting the FRZCLK bit, which
freeze the clock of USB controller. When FRZCLK is set, it is still possible to access to the fol-
lowing registers:
Moreover, when FRZCLK is set, only the following interrupts may be triggered:
When the USB interface is configured in device mode, the speed selection (Full Speed or Low
Speed) depends on the UDP/UDM pull-up. The LSM bit in UDCON register allows to select an
internal pull up on UDM (Low Speed mode) or UDP(Full Speed mode) data lines.
Figure 21-14. Device mode Speed Selection
• the HWUPI interrupt is triggered in the Host mode (HOST set).
• the IDTI interrupt is triggered
• the VBUSTI interrupt is triggered
• USBCON, USBSTA, USBINT
• UDCON (detach, ...)
• UDINT
• UDIEN
• UHCON
• UHINT
• UHIEN
• WAKEUPI
• IDTI
• VBUSTI
• HWUPI
UCAP
UDM
UDP
DETACH
UDCON.0
UDCON.2
LSM
Regulator
USB
7593K–AVR–11/09