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DOC7707 データシート(PDF) 244 Page - List of Unclassifed Manufacturers

部品番号 DOC7707
部品情報  Microcontroller with 8/16K Bytes of ISP Flash and USB Controller
PDF  307 Pages
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メーカー  ETC1 [List of Unclassifed Manufacturers]
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DOC7707 データシート(HTML) 244 Page - List of Unclassifed Manufacturers

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244
7707F–AVR–11/10
AT90USB82/162
Notes:
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
25.2
Fuse Bits
The AT90USB82/162 has four Fuse bytes. Table 25-3 - Table 25-5 describe briefly the function-
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.
Note:
1. See Table 9-2 on page 49 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 25-2.
Lock Bit Protection Modes
(1)(2) (Continued)
Memory Lock Bits
Protection Type
Table 25-3.
Extended Fuse Byte
Fuse Low Byte
Bit No
Description
Default Value : 0xF4
–7
–
1
–6
–
1
–5
–
1
–4
–
1
HWBE
3
Hardware Boot Enable
0 (programmed)
BODLEVEL2(1)
2
Brown-out Detector trigger level
1 (unprogrammed)
BODLEVEL1(1)
1
Brown-out Detector trigger level
0 (programmed)
BODLEVEL0(1)
0
Brown-out Detector trigger level
0 (programmed)



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