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56F8346 & ASM: Need help I can't understand it's exact meaning
56F8346 & ASM: Need help I can't understand it's exact meaning
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56F8346 & ASM: Need help I can't understand it's exact meaning
10-20-2006
05:43 AM
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Reallin
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报告不当内容
move.l #>>xxxx,r0
what 's the meaning of >> ? Anybody help me
or give me an example and show me the result
thx
Message Edited by Alban on
2006-10-23
11:00 AM
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10-30-2006
05:16 PM
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admin
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As far as i understood "#>>" point to long immediate data (see 56800ERM - 3.6.1 Addressing mode).
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10-30-2006
07:45 PM
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mke_et
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If you mean the '>>' that's a 'shift'. It's an assembler command.
In the example bootcode for the 9S12 there was a sequence that went:
ldab LoadAddr, pcr ; Get high byte of address
cmpb #SRecLow>>16 ; Less than C0000?
bhs ChkHiLimit
In this case, the SRecLow value is right shifted 16 bits so that the 'page' can be referenced (checked) against an 8-bit value
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10-23-2006
08:39 AM
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Reallin
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wrong space, hehe
the chip is 56F8346 ^^
maybe i should ask this in forum 16-bit microcontrollers
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10-20-2006
08:18 AM
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SimonMarsden_de
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Sorry, not sure. What assembler are you using? Does the code actually assemble?
Two things puzzle me about this code. I would not expect >> to be legal in this context, and I don't know what the 'r0' register is - I would expect e.g. 'a0' or 'd0'.
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