Fuse bits, Atmega169v/l – Rainbow Electronics Atmega169L User Manual
Page 266
266
ATmega169V/L
2514A–AVR–08/02
Notes:
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
Fuse Bits
The ATmega169 has three Fuse bytes. Table 118 - Table 120 describe briefly the func-
tionality 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.
Notes:
1. See Table 17 on page 39 for BODLEVEL Fuse decoding.
2. See “Alternate Functions of Port G” on page 69 for description of RSTDISBL Fuse.
1
1
1
No restrictions for SPM or LPM accessing the Boot Loader
section.
2
1
0
SPM is not allowed to write to the Boot Loader section.
3
0
0
SPM is not allowed to write to the Boot Loader section,
and 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.
4
0
1
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 117. Lock Bit Protection Modes
(1)(2)
(Continued)
Memory Lock Bits
Protection Type
Table 118. Extended Fuse Byte
Fuse Low Byte
Bit No
Description
Default Value
–
7
–
1
–
6
–
1
–
5
–
1
–
4
–
1
3
Brown-out Detector trigger level
1 (unprogrammed)
BODLEVEL1
2
Brown-out Detector trigger level
1 (unprogrammed)
1
Brown-out Detector trigger level
1 (unprogrammed)
RSTDISBL
0
External Reset disable
1 (unprogrammed)