
465
8266A-MCU Wireless-12/09
Memory Lock Bits Protection Type
BLB1 Mode BL12 BL11
1 1 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.
3 0 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.
4 0 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.
Notes: 1. Program the Fuse bits and Boot Lock bits before programming the LB1 and
LB2.
2. “1” means un-programmed, “0” means programmed.
31.2 Fuse Bits
The ATmega128RFA1 has three Fuse bytes. Table 31-3 below – Table 31-5 on page
466 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 31-3. Extended Fuse Byte
Fuse Low Byte Bit No Description Default Value
− 7 − 1
− 6 − 1
− 5 − 1
− 4 − 1
− 3 − 1
BODLEVEL2
(1)
2 Brown-out Detector trigger level 1 (un-programmed)
BODLEVEL1
(1)
1 Brown-out Detector trigger level 1 (un-programmed)
BODLEVEL0
(1)
0 Brown-out Detector trigger level 1 (un-programmed)
Notes: 1. See Table 34-23 on page 503 for BODLEVEL Fuse decoding.
Table 31-4. Fuse High Byte
Fuse High Byte Bit No Description Default Value
OCDEN
(4)
7 Enable On-chip debugging
(OCD)
1 (un-programmed, OCD
disabled)
JTAGEN 6 Enable JTAG interface 0 (programmed, JTAG
enabled)
SPIEN
(1)
5 Enable Serial Program and Data
Downloading (SPI)
0 (programmed, SPI
programming enabled)
WDTON
(3)
4 Watchdog Timer always on 1 (un-programmed)
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