AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 367

• 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

29.2
7593K–AVR–11/09
Fuse Bits
Table 29-2.
Notes:
The AT90USB64/128 has four Fuse bytes.
ality of all the fuses and how they are mapped into the Fuse bytes. Note that the fuses are read
as logical zero, “0”, if they are programmed.
Table 29-3.
Note:
BLB1 Mode
–
–
–
–
HWBE
BODLEVEL2
BODLEVEL1
BODLEVEL0
Fuse Low Byte
1
2
3
4
Memory Lock Bits
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
1. See
(1)
(1)
(1)
Lock Bit Protection Modes
Extended Fuse Byte (0xF3)
BLB12
Table 8-2 on page 60
1
1
0
0
7
6
5
4
2
1
0
3
Bit No
BLB11
1
0
0
1
Description
–
–
–
–
Hardware Boot Enable
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
Protection Type
No restrictions for SPM or (E)LPM accessing the Boot
Loader section.
SPM is not allowed to write to the Boot Loader section.
SPM is not allowed to write to the Boot Loader section,
and (E)LPM executing from the Application section is not
allowed to read from the Boot Loader section. If Interrupt
Vectors are placed in the Application section, interrupts
are disabled while executing from the Boot Loader section.
(E)LPM executing from the Application section is not
allowed to read from the Boot Loader section. If Interrupt
Vectors are placed in the Application section, interrupts
are disabled while executing from the Boot Loader section.
for BODLEVEL Fuse decoding.
(1)(2)
Table 29-3
(Continued)
-
Table 29-5
AT90USB64/128
Default Value
1
1
1
1
0 (programmed)
0 (programmed)
1 (unprogrammed)
1 (unprogrammed)
describe briefly the function-
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