68HC11 Asm - Hand Assembly

Hi,

I am writing to ask if anyone knows how to hand assemble a simple
68HC11 program?
My problem is getting the op code.
I am using the standard instruction set.
I know that you have to count the number of CPU cycles for each
instruction.

Does anybody know of a good tutorial on this?

Thanks,
Mickey

"Mickey" <mickey.allroid@gmail.com> wrote in message 
news:1116165951.360742.37660@f14g2000cwb.googlegroups.com...
> Hi,
>
> I am writing to ask if anyone knows how to hand assemble a simple
> 68HC11 program?
> My problem is getting the op code.
> I am using the standard instruction set.
> I know that you have to count the number of CPU cycles for each
> instruction.

You need to know the number of bytes for each instruction, not the number of 
clock cycles, so that you can write down the address of each instruction. 
Why not use an assembler, it's much easier?

Leon 

On 15 May 2005 07:05:51 -0700, the renowned "Mickey"
<mickey.allroid@gmail.com> wrote:

>Hi,
>
>I am writing to ask if anyone knows how to hand assemble a simple
>68HC11 program?
>My problem is getting the op code.


Read this: 
http://www.ee.ryerson.ca:8080/~jkoch/data_pdf/hc11rm.pdf



Best regards, 
Spehro Pefhany
-- 
"it's the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

Mickey wrote:

> Hi,
> 
> I am writing to ask if anyone knows how to hand assemble a simple
> 68HC11 program?
> My problem is getting the op code.
> I am using the standard instruction set.
> I know that you have to count the number of CPU cycles for each
> instruction.
> 
> Does anybody know of a good tutorial on this?

I have always found the Leventhal books very good on such topics. However, 
if you already have the instruction set to hand (in the datasheets for the 
processor) you just need to take note of how many bytes each instruction 
occupies so that you can calculate the next instruction addresses. Be sure 
to count the negative direction properly too (when doing jumps back to the 
start of a loop).

-- 
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Hi,
try this for assembly and testing (free HC11 simulator):
http://mypage.bluewin.ch/a-z/peter_bruenisholz/

Regards
Peter