16.6.2 Control B
| Name: | CTRLB |
| Offset: | 0x01 |
| Reset: | 0x30 |
| Property: | Configuration Change Protection |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| FLMAPLOCK | FLMAP[1:0] | EEWP | APPDATAWP | BOOTRP | APPCODEWP | ||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 1 | 1 | 0 | 0 | 0 | 0 | ||
Bit 7 – FLMAPLOCK Flash Mapping Lock
This bit is cleared by a Reset.
This bit is set by writing a '1' to it.
Writing a ‘0’ to this bit has no effect.
Writing a ‘1’ to this bit prevents further writing of the FLMAP
bit field.
Bits 5:4 – FLMAP[1:0] Flash Section Mapped into Data Space
Select what part (in blocks of 32 KB) of the Flash will be mapped as part of the
CPU data space and accessible through LD/ST
instructions.
This bit field controls what part of the Flash, in blocks of 32 KB, will be mapped to the CPU data space.
This bit field is not under Configuration Change Protection.
| Value | Name | Mapped Flash Section (KB) | |||
|---|---|---|---|---|---|
| 8 KB Flash | 16 KB Flash | 32 KB Flash | 64 KB Flash | ||
0 | SECTION0 | 0-8 | 0-16 | 0-32 | 0-32 |
1 | SECTION1 | 32-64 | |||
2 | SECTION2 | 0-32 | |||
3 | SECTION3 | 32-64 | |||
Bit 3 – EEWP EEPROM Write Protect
This bit is cleared by a Reset.
This bit is set by writing a '1' to it.
Writing a ‘0’ to this bit has no effect.
Writing a ‘1’ to this bit prevents further updates of the
EEPROM.
Bit 2 – APPDATAWP Application Data Write Protection
This bit is cleared by a Reset.
This bit is set by writing a '1' to it.
Writing a ‘0’ to this bit has no effect.
Writing a ‘1’ to this bit prevents further updates to the
Application Data section.
Bit 1 – BOOTRP Boot Section Read Protection
This bit is cleared by a Reset.
This bit is set by writing a '1' to it.
Writing a ‘0’ to this bit has no effect.
Writing a ‘1’ to this bit protects the BOOT section from reading
and instruction fetching. If a read is issued from the other Flash sections, it
will return ‘0’. An instruction fetch from the BOOT section
will return an NOP instruction. This bit can only be written
from the BOOT section. The read protection will only take effect when leaving
the BOOT section after the bit is written.
Bit 0 – APPCODEWP Application Code Write Protection
This bit is cleared by a Reset.
This bit is set by writing a '1' to it.
Writing a ‘0’ to this bit has no effect.
Writing a ‘1’ to this bit prevents further updates to the
Application Code section.