XMEGAA datasheet(34/445 Pages) ATMEL

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8077H–AVR–12/09

XMEGA A

• Bit 5:4 - BLBA[1:0]: Boot Lock Bit Application Section

These bits indicate the locking mode for the Application Section. Even though the BLBA bits are

writable, they can only be written to a stricter locking. Resetting the BLBA bits is only possible by

executing a Chip Erase Command.

Table 4-8.

Boot Lock Bit for The Boot Loader Section

BLBB[1:0]

Group Configuration

Description

NOLOCK

No Lock, no restrictions for SPM and (E)LPM accessing

the Boot Loader section.

WLOCK

Write Lock, SPM is not allowed to write the Boot Loader

section

RLOCK

Read Lock, (E)LPM executing from the Application

section is not allowed to read from the Boot Loader

section.

If the interrupt vectors are placed in the Application

section, interrupts are disabled while executing from the

Boot Loader section.

RWLOCK

Read and Write Lock, 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 the interrupt vectors are placed in the Application

section, interrupts are disabled while executing from the

Boot Loader section

Table 4-9.

Boot Lock Bit for the Application Section

BLBA[1:0]

Group Configuration

Description

NOLOCK

No Lock, no restrictions for SPM and (E)LPM accessing

the Application Section.

WLOCK

Write Lock, SPM is not allowed to write them

Application Section

RLOCK

Read Lock, (E)LPM executing from the Boot Loader

Section is not allowed to read from the Application

Section.

If the interrupt vectors are placed in the Boot Loader

Section, interrupts are disabled while executing from the

Application Section.

RWLOCK

Read and Write Lock, SPM is not allowed to write to the

Application Section and (E)LPM executing from the

Boot Loader Section is not allowed to read from the

Application section.

If the interrupt vectors are placed in the Boot Loader

Section, interrupts are disabled while executing from the

Application Section.

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