Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual de usuario descargar pdf (Pagina 79)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

17-6

17.5 Family 3 Commands: CRC Variable Length (Password Protected)

Command 30h—CRC Code Variable Length

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 (LengthH:LengthL) bytes/words starting at (AddrH:AddrL).

Command 31h—CRC Data Variable Length

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 (LengthH:LengthL) bytes/words starting at (AddrH:AddrL).

17.6 Family 4 Commands: Verify Variable Length (Password Protected)

Command 40h—Verify Code Variable Length

This command operates in the same manner as the “Load Code Variable Length” command, except that instead of

programming the input data into flash memory, it verifies that the input data matches the data already in code space.

If the data does not match, the status code is set to reflect this failure.

Command 41h—Verify Data Variable Length

This command operates in the same manner as the “Load Data Variable Length” command, except that instead of

writing the input data into data SRAM, it verifies that the input data matches the data already in data space. If the data

does not match, the status code is set to reflect this failure.

I/O BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5 BYTE 6 BYTE 7 BYTE 8 BYTE 9

Input (to CRC

< 256 bytes)

30h 1 AddrL AddrH Length 00h 00h 00h 00h

Output

CrcH CrcL 03Eh

I/O BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5 BYTE 6 BYTE 7 BYTE 8 BYTE 9 BYTE 10

Input (to CRC

256+ bytes)

30h 2 AddrL AddrH LengthL LengthH 00h 00h 00h 00h

Output

CrcH CrcL 03Eh

I/O BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5 BYTE 6 BYTE 7 BYTE 8 BYTE 9

Input (to CRC

< 256 bytes)

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

Output

CrcH CrcL 03Eh

I/O BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5 BYTE 6 BYTE 7 BYTE 8 BYTE 9 BYTE 10

Input (to CRC

256+ bytes)

31h 2 AddrL AddrH LengthL LengthH 00h 00h 00h 00h

Output

CrcH CrcL 03Eh

I/O BYTE 1 BYTE 2 BYTE 3 BYTE 4

(LENGTH)

BYTES

BYTE

LENGTH+5

BYTE

LENGTH+6

Input

40h Length AddressL AddressH Data to verify 00h 00h

Output

03Eh

I/O BYTE 1 BYTE 2 BYTE 3 BYTE 4

(LENGTH)

BYTES

BYTE

LENGTH+5

BYTE

LENGTH+6

Input

41h Length AddressL AddressH Data to verify 00h 00h

Output

03Eh

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 146 147

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