Maxim Integrated MAXQ20-Based Microcontroller Bootloader Command Reference - Manual (Page 4)

MAXQ20-Based Microcontroller Bootloader Command Reference
4
Family 0 Commands (Always Available)
Command 00h—No Operation
Byte1
Input 00h
Output 03Eh
Command 01h—Exit Loader
Byte1 Byte2
Input 01h 00h
Output 03Eh
This command causes the bootloader command loop to exit. Upon exit, the SPE bit is cleared and the device
performs and internal reset. Following the reset, execution jumps to the beginning of application code at address
0000h.
Command 02h—Master Erase
Byte1 Byte2 Byte3
Input 02h 00h 00h
Output 03Eh 00h 03Eh
This command erases (programs to FFFFh) all words in the program flash memory and writes all words in the
data SRAM and the AES cryptographic memory to zero. After this command completes, if SL=1 the security lock
bit is automatically cleared and the device resets, but the device will still remain in loader mode.
Devices which support the Set Context command require the desired context to be set before executing this
command. The selected context will designate which area(s) (system, user loader, or user application) will be
erased.
Command 03h—Password Match
Byte1 Bytes 2 … 33 Byte 34 Byte 35
Input 03h 32-byte password value 00h 00h
Output 03Eh
This command is used to gain access to memory on devices protected by the 32-byte password match feature.
Devices which support the Set Context command require the desired context to be set before executing this
command. The selected context will designate which area (system, user loader, or user application) the password
will be compared against.
Command 04h—Get Status
Byte1 Byte2 Byte3 Byte4 Byte5
Input 04h 00h 00h 00h 00h
Output Flags Status Code 03Eh
The status code returned by this command is defined in Table 1. The flags byte contains the bit status flags
shown in Table 2.