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How to disable RESET HIGH out feature for AT89S52 in keil c51?

Ahmed Gamal

Hello

I use At89s52 and i want to disable RESET HIGH out feature by set DISRTO
bit in SFR AUXR (address 8EH) but AUXR register isn't defined in <REGX52.h> file

so how can i disable this feature in Keil c51??

Note: i use Kiel C51 uvision 4

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  • 0 in reply to Ahmed Gamal

    What did you use before? No components at all on the reset pin?

    But still note that a RC reset is the worst form of reset you can try. It only works in a situation where VCC has a very distinct rise time and a very distinct fall time, and where there is a guaranteed minimum delay between power-off and next power-on. And even then, you have a solution where the processor will continue to run a number of cycles with too low supply on power-off - so writes to EEPROM could destroy the contents of the memory and there can be accidental activation of external hardware.

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  • 0 in reply to Ahmed Gamal

    What did you use before? No components at all on the reset pin?

    But still note that a RC reset is the worst form of reset you can try. It only works in a situation where VCC has a very distinct rise time and a very distinct fall time, and where there is a guaranteed minimum delay between power-off and next power-on. And even then, you have a solution where the processor will continue to run a number of cycles with too low supply on power-off - so writes to EEPROM could destroy the contents of the memory and there can be accidental activation of external hardware.

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