ATMEGA48V_11 ATMEL [ATMEL Corporation], ATMEGA48V_11 Datasheet - Page 272

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ATMEGA48V_11

Manufacturer Part Number
ATMEGA48V_11
Description
8-bit Atmel Microcontroller with 4/8/16K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
27.5
2545T–AVR–05/11
Boot loader lock bits
Figure 27-2. Memory sections.
Note:
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
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 pro-
gramming 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.
Table 27-2 on page 273
1. The parameters in
Boot loader flash section
Application flash section
Application flash section
Boot loader flash section
Application flash section
Application flash section
Program memory
Program memory
BOOTSZ = '11'
BOOTSZ = '01'
Figure 27-2
and
0x0000
End RWW
Start NRWW
End application
Start boot loader
Flashend
0x0000
End RWW
Start NRWW
End application
Start boot loader
Flashend
Table 27-3 on page 273
are given in
Table 27-6 on page
Boot loader flash section
Application flash section
Application flash section
Boot loader flash section
Application flash section
Program memory
Program memory
BOOTSZ = '10'
BOOTSZ = '00'
for further details. The Boot Lock bits
ATmega48/88/168
281.
0x0000
End RWW
Start NRWW
End application
Start boot loader
Flashend
0x0000
End RWW, end application
Start NRWW, start boot loader
Flashend
272

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