RE: [Sdcc-user] combined code and data segment

[Patrick C. <Cal...@mi...>]

>From: paul <pa...@ww...>
>To: sdc...@li...
>Date: Thu, 7 Mar 2002 14:09:09 -0500 (EST)
>Subject: [Sdcc-user] combined code and data segment

>I'm using sdcc to program  an 8032ah.  It's working great.  Great work
>guys.

>As described in the Intel MCS-50 Microcontroller Family User's manual,
>I have combined the Code and External Data Segment:

>"External Program Memory  and external Data Memory may  be combined if
>desired by applying the RD/ and  PSEN/ signals to the inputs of an AND
>gate  and using  the output  of the  gate as  the read  strobe  to the
>external Program/Data memory. "

>I tie this line line to a SRAM chip.  This combined model allows me to
>test code out  without burning a prom/ eprom or flash.   So far all of
>my code  is in the external  RAM, but all  of my variables are  in the
>(small) internal RAM.  I'd like to get the variables out into external
>SRAM,  and start  using the  SRAM  for storage  as well  as code.   My
>question is,  are there  command line options  to support  this memory
>model?  I  guess I want my data  segment to follow my  my code segment
>(or vice  versa).  I haven't tested  it yet, but  I'm assuming without
>the correct options, the code will  be placed at the same locations as
>the data, which in my case obviously won't work.

>thanks,

>Paul






Hi Paul,

You can use the --xram-loc sdcc option to choose where you put your external
datas and the --code-loc for the code.

	
Patrick.