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PDATA and XDATA

Jerry Black

If I use PDATA for my Stack. will any of my XDATA overlap? or is Keil smart enough to prevent that? Does it mean the RAM(XDATA) I have is 2048 - 256 for pdata?

MCU: AT89C51CC03
Memory Model: Compact

PBPSTACK EQU 1
PBPSTACKTOP EQU 0xFF +1

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  • 0 in reply to Andy Neil

    While. I have the 8051 building a 32 bit CRC from data it streams from the SDcard. I found that is was twice as fast when I moved my stack into pdata. I did a lot of changing and moving of memory to achieve maximum speed.
    it builds a 32 bit CRC on 512K streamed from the SDcard in just over 4 mins.

    Also, I have done lots of research on processors, I was mostly wondering about a good development kit. Not to expensive. I got a quote form the Zii processors stuff and they wanted 7K.

Reply
  • 0 in reply to Andy Neil

    While. I have the 8051 building a 32 bit CRC from data it streams from the SDcard. I found that is was twice as fast when I moved my stack into pdata. I did a lot of changing and moving of memory to achieve maximum speed.
    it builds a 32 bit CRC on 512K streamed from the SDcard in just over 4 mins.

    Also, I have done lots of research on processors, I was mostly wondering about a good development kit. Not to expensive. I got a quote form the Zii processors stuff and they wanted 7K.

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