20.8.1 Control A
| Name: | CTRLA |
| Offset: | 0x00 |
| Reset: | 0x0000 |
| Property: | PAC Write-Protection |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| CMDEX[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CMD[6:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
Bits 15:8 – CMDEX[7:0] Command Execution
When this bit group is written to the key value 0xA5, the command written to CMD will be executed. If a value different from the key value is tried, the write will not be performed and the Programming Error bit in the Status register (STATUS.PROGE) will be set. PROGE is also set if a previously written command is not completed yet.
The key value must be written at the same time as CMD. If a command is issued through the APB bus on the same cycle as an AHB bus access, the AHB bus access will be given priority. The command will then be executed when the NVM block and the AHB bus are idle.
INTFLAG.READY must be '1' when the command is issued.
Bit 0 of the CMDEX bit group will read back as '1' until the command is issued.
Bits 6:0 – CMD[6:0] Command
These bits define the command to be executed when the CMDEX key is written.
| CMD[6:0] | Group Configuration | Description |
|---|---|---|
| 0x00-0x01 | - | Reserved |
| 0x02 | ER | Erase Row - Erases the row addressed by the ADDR register in the NVM main array. |
| 0x03 | - | Reserved |
| 0x04 | WP | Write Page - Writes the contents of the page buffer to the page addressed by the ADDR register. |
| 0x05 | EAR |
Erase Auxiliary Row - Erases the auxiliary row addressed by the ADDR register. This command can be given only when the security bit is not set and only to the User Configuration Row. |
| 0x06 | WAP |
Write Auxiliary Page - Writes the contents of the page buffer to the page addressed by the ADDR register. This command can be given only when the security bit is not set and only to the User Configuration Row. |
| 0x07-0x3F | - | Reserved |
| 0x40 | LR | Lock Region - Locks the region containing the address location in the ADDR register. |
| 0x41 | UR | Unlock Region - Unlocks the region containing the address location in the ADDR register. |
| 0x42 | SPRM | Sets the Power Reduction Mode. |
| 0x43 | CPRM | Clears the Power Reduction Mode. |
| 0x44 | PBC | Page Buffer Clear - Clears the page buffer. |
| 0x45 | SSB | Set Security Bit - Sets the security bit by writing 0x00 to the first byte in the lockbit row. |
| 0x46 | INVALL | Invalidates all cache lines. |
| 0x47-0x7F | - | Reserved |