Maxim Integrated MAXQ Family Users Guide: MAXQ2000 Supplement - Manual (Page 59)

All commands in Family 0 can be executed without first matching the password. All other commands (in Families 1x through Fx) are
password protected; the password must first be matched before these commands can be executed.
A special case exists when the program memory has not been initialized (following master erase). If the password (stored in word locations
0010h to 001Fh in program memory) is all 0000h words or all FFFFh words, the bootloader treats the password as having been matched.
This allows access to password-protected commands following master erase (when no password has been set in program memory).
When providing addresses for code or data read or write to bootloader commands, all addresses run from 0000h to (memory size–1).
Family 0 Commands (Not Password Protected)
Command 00h—No Operation
Command 01h—Exit Loader
This command causes the bootloader command loop to exit, and execution jumps to the beginning of application code.
Command 02h—Master Erase
This command clears (programs to FFFFh) all words in the program flash memory.
Command 03h—Password Match
This command accepts a 32-byte password value, which is matched against the password in program memory (in byte mode) from
addresses 0020h to 003Fh. If the value matches, the password lock is cleared.
Command 04h—Get Status
The status code returned by this command is defined in Table 26. The flags byte contains the following bit status flags.
MAXQ Family User’s Guide:
MAXQ2000 Supplement
I/O Byte 1
Input 00h
Output
I/O Byte 1
Input 01h
Output
I/O Byte 1
Input 02h
Output
I/O Byte 1 32 Bytes
Input 03h Password value
Output
I/O Byte 1 Byte 2
Input 04h
Output Flags Status Code
Maxim Integrated 59