atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 366

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

29.2
366
Fuse Bits
ATmega32U4
Table 29-2.
Notes:
The ATmega32U4 has four Fuse bytes.
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
BLB12
Table 8-2 on page 50
1
1
0
0
7
6
5
4
3
2
1
0
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.
Table 29-3
(1)(2)
(Continued)
-
Table 29-5
describe briefly the functionality
Default Value
1
1
1
1
0 (programmed)
0 (programmed)
1 (unprogrammed)
1 (unprogrammed)
7766A–AVR–03/08