ATMEGA32U4-MUR Atmel, ATMEGA32U4-MUR Datasheet - Page 347

• Manufacturer Part Number: ATMEGA32U4-MUR
• Description: MCU AVR 16K FLASH 16MHZ 44VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32U4-MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

28.2
7766F–AVR–11/10
Fuse Bits
Table 28-2.
Notes:
The ATmega16U4/ATmega32U4 has three bytes.
functionality 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 28-3.
Notes:
BLB1 Mode
Fuse Low Byte
–
–
–
–
HWBE
BODLEVEL2
BODLEVEL1
BODLEVEL0
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
2. “1” means unprogrammed, “0” means programmed
(1)
(1)
(1)
Lock Bit Protection Modes
Extended Fuse Byte
BLB12
Table 8-2 on page 52
1
1
0
0
Bit No
7
6
5
4
3
2
1
0
BLB11
Description
–
–
–
–
Hardware Boot Enable
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
1
0
0
1
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.
(2)
for BODLEVEL Fuse decoding.
(1)(2)
(Continued)
Table 28-3
ATmega16/32U4
0 (programmed)
-
ATmega16/32U4
Table 28-5
1 (unprogrammed)
1 (unprogrammed)
0 (programmed)
Default Value
describe briefly the
1
1
1
1
ATmega16/32U4RC
1 (unprogrammed)
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