Studio 4 operand error

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petros047
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Posted by petros047: Wed. Mar 7, 2012 - 12:52 AM
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Can some one told me why my compiler give operand error out of range 0x22 with this code on mega8
Loop:
SBIC ASSR,TCN2UB
RJMP Loop
The same with TCR2UB

Thank you

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Tools, Atmel Studio (AVR-related), ATmega8
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sternst
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Posted by sternst: Wed. Mar 7, 2012 - 01:08 AM
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Because SBIC has a limited address range, and ASSR is not within this range.

Stefan Ernst

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indianajones11
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Posted by indianajones11: Wed. Mar 7, 2012 - 05:20 AM
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Read m8 datasheet, memory section sub-section "I/O memory" .

1) Studio 4.18 build 716 (SP3)
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petros047
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Posted by petros047: Wed. Mar 7, 2012 - 06:57 AM
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Alternative instruction for that job?

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sternst
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Posted by sternst: Wed. Mar 7, 2012 - 07:35 AM
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petros047 wrote:
Alternative instruction for that job?
in
andi
brne

Stefan Ernst

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MBedder
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Posted by MBedder: Wed. Mar 7, 2012 - 07:36 AM
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Loop:
        in      r16,ASSR
        sbrc    r16,TCN2UB
        rjmp    Loop

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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petros047
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Posted by petros047: Wed. Mar 7, 2012 - 07:44 AM
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Thanks every one
I suppose this will work
LOOP:
in r16,assr
andi r16,~(1<<TCN2UB)
BRNE LOOP

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sternst
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Posted by sternst: Wed. Mar 7, 2012 - 07:58 AM
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petros047 wrote:
I suppose this will work
No. Why the '~'?

BTW: You can test more than one bit at once with the andi.

Stefan Ernst

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petros047
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Posted by petros047: Wed. Mar 7, 2012 - 08:06 AM
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Because i have to wait until become zero, wrong syntax?

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sternst
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Posted by sternst: Wed. Mar 7, 2012 - 09:07 AM
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petros047 wrote:
Because i have to wait until become zero, wrong syntax?
No, wrong semantic.

Stefan Ernst

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Gold Markclawson
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Posted by clawson: Wed. Mar 7, 2012 - 09:23 AM
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To add to that: remove the ~ and change BRNE to BREQ

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petros047
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Posted by petros047: Wed. Mar 7, 2012 - 09:40 AM
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Thanks a lot I try it tonight hope it will work now

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sternst
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Posted by sternst: Wed. Mar 7, 2012 - 09:41 AM
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clawson wrote:
and change BRNE to BREQ
Eh?

Stefan Ernst

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Gold Markclawson
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Posted by clawson: Wed. Mar 7, 2012 - 09:47 AM
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Sorry more caffeine needed here!

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MBedder
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Posted by MBedder: Wed. Mar 7, 2012 - 02:36 PM
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What's wrong with my SBRC above - another extra instruction to learn?

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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sternst
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Posted by sternst: Wed. Mar 7, 2012 - 04:18 PM
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MBedder wrote:
What's wrong with my SBRC above
Nothing is wrong, but it is quite likely that he has to wait for more than one bit in that register, and with andi he can do that in one loop.
MBedder wrote:
another extra instruction to learn?
Why not? Andi and brne are common instructions, he will need them sooner or later anyway.

Stefan Ernst

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MBedder
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Posted by MBedder: Wed. Mar 7, 2012 - 07:06 PM
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His initial code was SBIC on an out of coverage SFR. He asked for an alternative instruction, and I gave him exactly what he was asking for - SBRC, so why invent the non-existing demands about checking multiple bits?

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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