Discussion in "8051 Discussion Forum" started by    bastik    Jan 12, 2018.
Fri Jan 12 2018, 10:37 AM
I have device with SAB80C535 microcontroller and I was wondering if any one had a good substitute for this microcontroller? (which is of course still produced and can be bought)
Fri Jan 12 2018, 06:30 PM
What exactly is your situation ?
I very much doubt there is a drop in replacement.
If your are able to redesign the board
and write your own software there are several options.

There are several SAB 80535 on ebay, some from your country.

[ Edited Sat Jan 13 2018, 02:50 AM ]
Sat Jan 13 2018, 09:38 PM
For now I don’t have much information about device in which this microcontroller is installed. My task is to replace SAB80C535 with a newer microcontroller that is currently being manufactured. It is obvious that the board will have to be redesigned. I know that my answer contains not much information, unfortunately I do not know much more about this device. I just got the task of replacing the microcontroller with something newer. From what I know the device is equipped with external memory (Am27C256, SRM2264LCT), counter (PD71054) and 8-Bit ADC converter. The program was probably written in assembly language. So I assume that the new microcontroller should be popular, cheap and 8 bit.
Sat Jan 13 2018, 10:26 PM
This is clearly an old design.
A modern microcontroller will almost certainly combine
the controller ,Am27C256, SRM2264LCT, PD71054
and ADC converter into one chip.

There are MANY devices from several families that could do this cheaply.

If you have the original software you can find out what it did,
and think about how to reproduce it.

Whoever gave you the job, will have to give you all the information,
before you can do anything.
Sat Feb 03 2018, 10:40 PM
It took me a several days to find original software Unfortunately, the person who programmed the old microcontroller has left the company and there is nobody else who could advise me anything. I am only an intern with little experience gained while doing student projects and I am afraid that I will choose the wrong microcontroller.
Based on the code, I can say that it is used 20 I \ O microcontroller lines, 9 interrupt sources (7 external and two from peripherals: timer 0 and timer 2) and 3 A/D converter (two external) . What else do I have to pay attention to when selecting a microcontroller? As a replacement, I found the AT89C51AC3, but I do not know if it's a good choice. The device does not need to be upgraded with any new functions (of course, after replacing the processor it will be necessary to modify the software and the PCB) it is important that the new microcontroller is available on the market for the next few years.
Sun Feb 04 2018, 09:36 PM
The AT89C51AC3 or any replacement micro, may have the same functions,
but exactly how they work will be different.
The register addresses will almost certainly be different.

To make this work you will have to be sure you
understand the original code as well as the man that wrote it.
When you understand the code, you will be able to choose a replacement
and know what changes to make.

Fri Feb 09 2018, 05:29 PM
I have sent you a message.

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Mon Dec 03 2018, 06:17 PM
Please post questions in the forum. The chat box is for chat
Mon Dec 03 2018, 07:43 AM
help! I don't understand busy flag!
Sun Dec 02 2018, 09:01 PM
Mon Nov 12 2018, 06:58 AM
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
Tue Nov 06 2018, 03:36 PM
kindly any one give solution for my problem
Mon Nov 05 2018, 10:48 PM
Pins high is the normal state. You need a program to set them low
Sun Nov 04 2018, 06:41 PM
hello, i am niranjoy, alll the port of my 8051 is always high, even i erase all the program. why is it so happen and what is the problem. any one please help me!
Sun Nov 04 2018, 03:16 PM
BASAVARAJ g kudamble
hi I am interfacing GSM 300 to 8051 microcontroller to receive message from mobile
Sat Sep 29 2018, 07:28 PM
Please post questions in the forum.
Sat Sep 29 2018, 12:26 PM
Ashfaq Ch
hi i have some AT89C51RC microcontrollers already programed. some one help us to how to download from AT89C51RC and after study and edit all corractions reload to AT89C51RC controller



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