AT91SAM_14 datasheet(23/50 Pages) ATMEL

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SAM7S Series [DATASHEET]

6175KS–ATARM–25-Oct-12

8.8.3

Lock Regions

8.8.3.1 SAM7S512

Two Embedded Flash Controllers each manage 16 lock bits to protect 16 regions of the flash against inadvertent flash

erasing or programming commands. The SAM7S512 contains 32 lock regions and each lock region contains 64 pages of

256 bytes. Each lock region has a size of 16 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the LOCKE bit in the MC_FSR

The 16 NVM bits (or 32 NVM bits) are software programmable through the corresponding EFC User Interface. The

command “Set Lock Bit” enables the protection. The command “Clear Lock Bit” unlocks the lock region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.8.3.2 SAM7S256

The Embedded Flash Controller manages 16 lock bits to protect 16 regions of the flash against inadvertent flash erasing

or programming commands. The SAM7S256 contains 16 lock regions and each lock region contains 64 pages of 256

bytes. Each lock region has a size of 16 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the LOCKE bit in the MC_FSR

The 16 NVM bits are software programmable through the EFC User Interface. The command “Set Lock Bit” enables the

protection. The command “Clear Lock Bit” unlocks the lock region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.8.3.3 SAM7S128

The Embedded Flash Controller manages 8 lock bits to protect 8 regions of the flash against inadvertent flash erasing or

programming commands. The SAM7S128 contains 8 lock regions and each lock region contains 64 pages of 256 bytes.

Each lock region has a size of 16 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the LOCKE bit in the MC_FSR

The 8 NVM bits are software programmable through the EFC User Interface. The command “Set Lock Bit” enables the

protection. The command “Clear Lock Bit” unlocks the lock region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.8.3.4 SAM7S64

The Embedded Flash Controller manages 16 lock bits to protect 16 regions of the flash against inadvertent flash erasing

or programming commands. The SAM7S64 contains 16 lock regions and each lock region contains 32 pages of 128

bytes. Each lock region has a size of 4 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the LOCKE bit in the MC_FSR

The 16 NVM bits are software programmable through the EFC User Interface. The command “Set Lock Bit” enables the

protection. The command “Clear Lock Bit” unlocks the lock region.

Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash.

8.8.3.5 SAM7S321/32

The Embedded Flash Controller manages 8 lock bits to protect 8 regions of the flash against inadvertent flash erasing or

programming commands. The SAM7S321/32 contains 8 lock regions and each lock region contains 32 pages of 128

bytes. Each lock region has a size of 4 Kbytes.

If a locked-region’s erase or program command occurs, the command is aborted and the LOCKE bit in the MC_FSR

AT91SAM Datasheet(PDF) 23 Page - ATMEL Corporation