MOVW and MOVT

Dr. C. A. Hernandez-Gutierrez

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if you want to load a 32 bits value you should to write MOVW followed by MOVT. Where MOVT is move TOP.

MOVW writes the less significant 16 bits of a register.

for example :

MOVW R0, #0xAAAA

it means that R0 = 0x0000AAAA

MOVT means MOV TOP 

for example:

MOVT R0, 0xFFFF

it means that R0 = FFFF0000

Finally, we share an example:

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main

  MOV R3,#0

  MOVW R3, #0xABCD  ;MOV Wide

  MOVT R3, #0xFFFF  ;MOV TOP

  B main  ;JUMP to main address

  END

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After the program finish R3 is going to be:

R3 = 0xFFFFABCD

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