Microchip Technology megaAVR 0 Series Manual page 71

8.5.2 Control B
Name: CTRLB
Offset: 0x01
Reset: 0x00
Property: -
Bit 7
Access
Reset
Bit 1 – BOOTLOCK Boot Section Lock
Writing a '1' to this bit locks the boot section from read and instruction fetch.
If this bit is '1', a read from the boot section will return '0'. A fetch from the boot section will also return '0'
as instruction.
This bit can be written from the boot section only. It can only be cleared to '0' by a Reset.
This bit will take effect only when the boot section is left the first time after the bit is written.
Bit 0 – APCWP Application Code Section Write Protection
Writing a '1' to this bit protects the application code section from further writes.
This bit can only be written to '1'. It is cleared to '0' only by Reset.
©
2018 Microchip Technology Inc.
6 5
Nonvolatile Memory Controller (NVMCTRL)
4 3
Datasheet Preliminary
®
megaAVR 0-Series
2 1
BOOTLOCK APCWP
R/W
0
DS40002015A-page 71
0
R/W
0