219
2513L–AVR–03/2013
ATmega162/V
Figure 94. Memory Sectio
ns Note:
Boot Loader Lock
Bits
If no Boot Loader capability is needed, the entire Flash is available for application code. The
Boot Loader has two separate sets of Boot Lock bits which can be set independently. This gives
the user a unique flexibility to select different levels of protection.
The user can select:
To protect the entire Flash from a software update by the MCU
To protect only the Boot Loader Flash section from a software update by the MCU
To protect only the Application Flash section from a software update by the MCU
Allow software update in the entire Flash
See
Table 89 and
Table 90 for further details. The Boot Lock bits can be set in software and in
Serial or Parallel Programming mode, but they can be cleared by a chip erase command only.
The general Write Lock (Lock bit mode 2) does not control the programming of the Flash mem-
0x0000
Flashend
Program Memory
BOOTSZ = '11'
Application Flash Section
Boot Loader Flash Section
Flashend
Program Memory
BOOTSZ = '10'
0x0000
Program Memory
BOOTSZ = '01'
Program Memory
BOOTSZ = '00'
Application Flash Section
Boot Loader Flash Section
0x0000
Flashend
Application Flash Section
Flashend
End RWW
Start NRWW
Application flash Section
Boot Loader Flash Section
End RWW
Start NRWW
End RWW
Start NRWW
0x0000
End RWW, End Application
Start NRWW, Start Boot Loader
Application Flash Section
Read-While-Wr
ite
Section
No
Read-While-Wr
ite
Section
Read-While-Wr
ite
Section
No
Read-While-Wr
ite
Section
Read
While
Wr
ite
Section
No
Read
While
Wr
ite
Section
Read-While-Wr
ite
Section
No
Read-While-Wr
ite
Section
End Application
Start Boot Loader
End Application
Start Boot Loader
End Application
Start Boot Loader