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???
12/18/09 10:04
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 		 #171714 - external memory
Responding to: ???'s previous message
Mayank Mevada said:

Plz help me for 89v51rd2. I was using 89C51RD2 and my programme was working fine.

You MUST use the prefixes. There are several manufacturers of 89C51RD2, most notably Philips/NXP (P89C51RD2) and Temic/Atmel(T89C51RD2 or AT89C51RD2). There are few, but potentially significant differences between the two.

Mayank Mevada said:
Save This Code
Programme          data        xdata        code

not working        19.4        19233       30055
working            16.2          249       12830



You are apparently using external RAM (19kB of XDATA), so you should look at how the internal/external RAM (ERAM) is enabled/disabled by default, and how does the startup code manipulate the relevant SFR bits.

JW



List of 9 messages in thread
TopicAuthorDate
Problem with P89V51RD2            01/01/70 00:00      
   should i change my code to run on 'v51?            01/01/70 00:00      
      how does it fail            01/01/70 00:00      
         Re: Does not work?            01/01/70 00:00      
   external memory            01/01/70 00:00      
   that is a waaaay to large difference            01/01/70 00:00      
      Problem Solved            01/01/70 00:00      
         "set stack top" ?            01/01/70 00:00      
         You should still check            01/01/70 00:00      

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