Maxim Integrated MAXQ20-Based Microcontroller Bootloader Command Reference - Manual (Page 17)

MAXQ20-Based Microcontroller Bootloader Command Reference
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Family F Commands—Device Specific Commands
Family F commands are device-specific so only one command of a given command code will be supported per
device. The applicable user’s guide has details on which commands are supported for that device.
Command F0h—Get Context
Byte1 Byte2 Byte3
Input F1h 00h 00h
Output Context 03Eh
This command returns the current context setting
00h: System Context
01h: User Loader Context
02h: User Application Context
Command F1h—Set Permanent Loader Lockout
Byte1 Byte2 Byte3 Byte4 Byte5 Byte6
Input F1h 50h 4Ch 4Ch 4Fh 00h
Output 03Eh
This command disables the bootloader and debug functions of the device upon exiting the bootloader. Once the
bootloader has been exited, the only way to remove the loader lockout is for the user application to erase the last
page of flash under application software control.
Command F1h—Set Context
Byte1 Byte2 Byte3 Byte4
Input F1h Context 00h 00h
Output 03Eh
This command sets the context for program memory and verification.
00h: System Context
01h: User Loader Context
02h: User Application Context
Command F1h—Set Code Lock Bit
Byte1 Byte2 Byte3 Byte4 Byte5
Input F1h 00h 00h 00h 00h
Output 03Eh
This command sets the code lock bit and the password lock bit. All bootloader commands (except for those in
Family 0) are locked out. The Password Match command will not unlock the part. The Master erase command will
erase the part, clear the code lock bit and allow the part to be reprogrammed.