11.5.1 Control A
| Name: | CTRLA |
| Offset: | 0x00 |
| Reset: | 0x00 |
| Property: | Configuration Change Protection |
| 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 6:0 – CMD[6:0] Command
A change from one
command to another must always go through a No command (NOCMD)
or No operation (NOOP) command. If attempting to issue a
programming command (except NOCMD or NOOP)
while the Flash or EEPROM is busy, a Command Collision error is signalized in
the ERROR bit field in the STATUS register.
| Value | Name | Description |
|---|---|---|
| 0x00 | NOCMD | No command |
| 0x01 | NOOP | No operation |
| 0x02 | FLWR | Flash Write Enable |
| 0x08 | FLPER | Flash Page Erase Enable |
| 0x09 | FLMPER2 | Flash 2-page Erase Enable |
| 0x0A | FLMPER4 | Flash 4-page Erase Enable |
| 0x0B | FLMPER8 | Flash 8-page Erase Enable |
| 0x0C | FLMPER16 | Flash 16-page Erase Enable |
| 0x0D | FLMPER32 | Flash 32-page Erase Enable |
| 0x12 | EEWR | EEPROM Write Enable |
| 0x13 | EEERWR | EEPROM Erase and Write Enable |
| 0x18 | EEBER | EEPROM Byte Erase Enable |
| 0x19 | EEMBER2 | EEPROM 2-byte Erase Enable |
| 0x1A | EEMBER4 | EEPROM 4-byte Erase Enable |
| 0x1B | EEMBER8 | EEPROM 8-byte Erase Enable |
| 0x1C | EEMBER16 | EEPROM 16-byte Erase Enable |
| 0x1D | EEMBER32 | EEPROM 32-byte Erase Enable |
| 0x20 | CHER |
Erase Flash and EEPROM. EEPROM is skipped if the EESAVE fuse is set. (UPDI access only) |
| 0x30 | EECHER | Erase EEPROM |
| Other | - | Reserved |