move al to ar5

Mauro Fantina

Genius 3800 points

Hello,

I write some asm code

I need to move AL to AR5 registers

I try

MOV @AR5,@AL

but compiler tells me

"../communication/CRC16.asm", ERROR! at line 19: [E0004] Illegal operand combination

1 Assembly Error, No Assembly Warnings

>> Compilation failure

MOV @AR5,@AL; AR5 = seed

Errors in Source - Assembler Aborted

can someone help me ?

Have to save AR5 content before use this ?

over 10 years ago

0 Vishal_Coelho over 10 years ago

TI__Mastermind 20850 points

Use

MOVZ ARn,loc16 Load lower half of XARn and clear upper half

MOVZ AR5, AL - it will zero out the upper word of XAR5 and move AL into the lower word

0 Mauro Fantina over 10 years ago in reply to Vishal_Coelho

Genius 3800 points

Have I to save XAR5 content before use it in my asm code called by C code (and restore value vefore RETURN) ?

From SPRU514G page 132 the answer seems YES.

Can you confirm ?

0 Vishal_Coelho over 10 years ago in reply to Mauro Fantina

TI__Mastermind 20850 points

You dont have to save/restore XAR5. The calling convention (which you have posted) only requires XAR1/2/3 be saved/restored

0 Mauro Fantina over 10 years ago in reply to Vishal_Coelho

Genius 3800 points

the same for XAR6 ?

C2000™︎ microcontrollers

C2000 microcontrollers forum

move al to ar5