Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet
Product codes
MEGA328P-XMINI
267
ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]
Atmel-8271H-AVR- ATmega-Datasheet_08/2014
Figure 27-2.
Memory Sections
Note:
1. The parameters in the figure above are given in
27.5
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.
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
and
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 memory by SPM instruction. Similarly, the
general Read/Write Lock (Lock Bit mode 1) does not control reading nor writing by LPM/SPM, if it is attempted.
(Lock Bit mode 2) does not control the programming of the Flash memory by SPM instruction. Similarly, the
general Read/Write Lock (Lock Bit mode 1) does not control reading nor writing by LPM/SPM, if it is attempted.
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
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
Application Flash Section
Application Flash Section
Read-While-Wr
ite
S
ection
No Read-While-Wr
ite
S
ection
Read-While-Wr
ite
S
ection
No Read-While-Wr
ite
S
ection
Read-While-Wr
ite
S
ection
No Read-While-Wr
ite
S
ection
Read-While-Wr
ite
S
ection
No Read-While-Wr
ite
S
ection
End Application
Start Boot Loader
End Application
Start Boot Loader
End Application
Start Boot Loader