324
7679H–CAN–08/08
AT90CAN32/64/128
Figure 24-2. Memory Sections
Note: The parameters in the figure above are given in Table 24-6 on page 334.
24.4 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.
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
Flash end
Application Flash Section
Flash end
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 SectionApplication Flash Section
Application Flash Section
Read-While-Write
Section
No Read-While-Write
Section
Read-While-Write
Section
No Read-While-Write
Section
Read-While-Write
Section
No Read-While-Write
Section
Read-While-Write
Section
No Read-While-Write
Section
End Application
Start Boot Loader
End Application
Start Boot Loader
End Application
Start Boot Loader
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