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AT90USB646 Datasheet(PDF) 367 Page - ATMEL Corporation

Part # AT90USB646
Description  8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  459 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 367 Page - ATMEL Corporation

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367
7593H–AVR–11/08
ATmega32U6/AT90USB64/128
Notes:
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
29.2
Fuse Bits
The ATmega32U6/AT90USB64/128 has four Fuse bytes. Table 29-3 - Table 29-5 describe
briefly the 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.
Note:
1. See Table 8-2 on page 60 for BODLEVEL Fuse decoding.
BLB1 Mode
BLB12
BLB11
11
1
No restrictions for SPM or (E)LPM accessing the Boot
Loader section.
2
1
0
SPM is not allowed to write to the Boot Loader section.
30
0
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.
40
1
(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.
Table 29-2.
Lock Bit Protection Modes(1)(2) (Continued)
Memory Lock Bits
Protection Type
Table 29-3.
Extended Fuse Byte (0xF3)
Fuse Low Byte
Bit No
Description
Default Value
–7
–
1
–6
–
1
–5
–
1
–4
–
1
HWBE
3
Hardware Boot Enable
0 (programmed)
BODLEVEL2
(1)
2
Brown-out Detector trigger level
0 (programmed)
BODLEVEL1
(1)
1
Brown-out Detector trigger level
1 (unprogrammed)
BODLEVEL0
(1)
0
Brown-out Detector trigger level
1 (unprogrammed)



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