Maxim-integrated MAXQ20-Based Microcontroller Bootloader Command Re Manual de usuario descargar pdf (Pagina 9)

MAXQ20-Based Microcontroller Bootloader Command Reference

Family 3 Commands—CRC Variable Length

Command 30h—CRC Code Variable Length

Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8

Byte9

Input

(to CRC

< 256 units)

30h 1 AddrL AddrH

Lengt

00h 00h 00h 00h

Output

CrcH

CrcL

03Eh

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Byte9

Byte10

Input

(to CRC

256+ units)

30h 2 AddrL AddrH LenL LenH 00h 00h 00h 00h

Output

CrcH

CrcL

03Eh

This command has a slightly different format depending on the length of the CRC requested. It returns the CRC-

16 value (CrcH:CrcL) of the program flash – (Length) or (LenH:LenL) bytes/words starting at (AddrH:AddrL).

“Units” is either bytes or words, depending on which mode is currently selected.

Command 31h—CRC Data Variable Length

Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8

Byte9

Input

(to CRC

< 256 units)

31h 1 AddrL AddrH Length 00h 00h 00h 00h

Output

CrcH

CrcL

03Eh

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Byte9

Byte10

Input

(to CRC

256+ units)

31h 2 AddrL AddrH LenL LenH 00h 00h 00h 00h

Output

CrcH

CrcL

03Eh

This command has a slightly different format depending on the length of the CRC requested. It returns the CRC-

16 value (CrcH:CrcL) of the data SRAM – (Length) or (LenH:LenL) bytes/words starting at (AddrH:AddrL). “Units”

is either bytes or words, depending on which mode is currently selected.

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Maxim-integrated MAXQ20-Based Microcontroller Bootloader Command Re Manual de usuario Pagina 9

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