Maxim-integrated MAXQ20-Based Microcontroller Bootloader Command Re Bedienungsanleitung PDF herunterladen (Seite 7)

MAXQ20-Based Microcontroller Bootloader Command Reference

Family 1 Commands—Load Variable Length

Command 10h—Load Code Variable Length

Byte1 Byte2 Byte3 Byte4

(Length)

Bytes

Byte

Length+5

Byte

Length+6

Input

10h

Length

AddrL

AddrH

Data to load

00h

Output

03Eh

This command programs (Length) bytes of data into the program flash starting at byte address (AddrH:AddrL),

with the following restrictions.

• The low bit of the AddrL is always forced to zero, since instructions in program flash must be word

aligned.

• In byte mode, if an odd number of bytes is input, the final word written to the program flash will have its

most significant byte set to 00h by default.

• Memory locations in flash which have previously been loaded must be erased using the Master Erase or

Erase Code Fixed Length commands before they can be loaded with a different value.

• In keeping with standard MAXQ little-endian memory architecture, the least significant byte of each word

is loaded first. For example, loading bytes (11h, 22h, 33h, 44h) starting at address 0000h, the first two

words of program space will be written to (2211h, 4433h).

Command 11h—Load Data Variable Length

Byte1 Byte2 Byte3 Byte4

(Length)

Bytes

Byte

Length+5

Byte

Length+6

Input

11h

Length

AddrL

AddrH

Data to load

00h

Output

03Eh

This command writes (Length) bytes of data into the data SRAM starting at byte address (AddrH:AddrL).

1 2 3 4 5 6 7 8 9 10 11 12 ... 17 18

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Maxim-integrated MAXQ20-Based Microcontroller Bootloader Command Re Bedienungsanleitung Seite 7

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