8.1.5.2.3 Lock Regions
Several lock bits are used to protect write and erase operations on lock regions. A lock region is composed of several consecutive pages, and each lock region has its associated lock bit.
| Flash Size | Number of Lock Bits | Lock Region Size |
|---|---|---|
| 2 Mbytes | 256 (128 + 128) | 8 Kbytes |
| 1 Mbyte | 128 (64 + 64) | 8 Kbytes |
| 512 Kbytes | 64 (32 + 32) | 8 Kbytes |
The lock bits are software programmable through the SEFC user interface. The command “Set Lock Bit” enables the protection. The command “Clear Lock Bit” unlocks the lock region.
Asserting the ERASE signal clears the lock bits.