AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 304

• 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

304
AT90USB64/128
- 00: 1 bank
- 01: 2 banks
- 10: invalid
- 11: invalid
• ALLOC
Configure Pipe Memory
Set to configure the pipe memory with the characteristics.
Clear to update the memory allocation. Refer to the Memory Management chapter for more
details.
7 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 7 - INTFRQ7:0 - Interrupt Pipe Request Frequency
These bits are the maximum value in millisecond of the polling period for an Interrupt Pipe.
This value has no effect for a non-Interrupt Pipe.
• 7 - CFGOK - Configure Pipe Memory OK
Set by hardware if the required memory configuration has been successfully performed.
Cleared by hardware when the pipe is disabled. The USB reset and the reset pipe have no effect
on the configuration of the pipe.
• 6 - OVERFI - Overflow
Set by hardware when a the current Pipe has received more data than the maximum length of
the current Pipe. An interrupt is triggered if the FLERRE bit is set.
Shall be cleared by software. Setting by software has no effect.
• 5 - UNDERFI - Underflow
Set by hardware when a transaction underflow occurs in the current isochronous or interrupt
Pipe. The Pipe can’t send the data flow required by the device. A ZLP will be sent instead. An
interrupt is triggered if the FLERRE bit is set.
Shall be cleared by software. Setting by software has no effect.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
INTFRQ7
CFGOK
RW
R
7
0
7
0
INTFRQ6
OVERFI
RW
RW
6
0
6
0
INTFRQ5
UNDERFI
RW
RW
5
0
5
0
INTFRQ4
RW
4
0
4
0
-
INTFRQ3
RW
R
3
0
3
0
DTSEQ1:0
INTFRQ2
RW
R
2
0
2
0
INTFRQ1
RW
R
1
0
1
0
NBUSYBK
INTFRQ0 UPCFG2X
RW
R
7593K–AVR–11/09
0
0
0
0
UPSTAX