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MEGA128CAN Datasheet, PDF (326/413 Pages) ATMEL Corporation – Microcontroller WITH 128K BYTES OF ISP FLASH AND CAN CONTROLLER
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Fuse Bits
Table 123. Lock Bit Protection Modes(1)(2) (Continued)
Memory Lock Bits
Protection Type
2
1
0 SPM is not allowed to write to the Boot Loader section.
SPM is not allowed to write to the Boot Loader section, and
LPM executing from the Application section is not allowed to
3
0
0 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.
LPM executing from the Application section is not allowed to
4
0
1
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.
Notes: 1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
The AT90CAN128 has three Fuse bytes. Table 124, Table 125 and Table 126 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.
Table 124. Extended Fuse Byte
Fuse Extended Bit
Byte
No Description
Default Value
–
7–
1
–
6–
1
–
5–
1
–
4
BODLEVEL2(1) 3
BODLEVEL1(1) 2
BODLEVEL0(1) 1
–
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
1
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
TA0SEL
0 (Reserved for factory tests)
1 (unprogrammed)
Notes: 1. See Table 20 on page 50 for BODLEVEL Fuse decoding.
Table 125. Fuse High Byte
Fuse High Bit
Byte
No Description
OCDEN(4) 7 Enable OCD
JTAGEN(5) 6 Enable JTAG
SPIEN(1)
WDTON(3)
5
Enable Serial Program and Data
Downloading
4 Watchdog Timer always on
EESAVE
3
EEPROM memory is preserved
through the Chip Erase
Default Value
1 (unprogrammed, OCD disabled)
0 (programmed, JTAG enabled)
0 (programmed, SPI prog. enabled)
1 (unprogrammed)
1 (unprogrammed, EEPROM not
preserved)
326 AT90CAN128
4250E–CAN–12/04
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