AT89C51- Datasheet

Djsarkar · Aug 30, 2020

Hi
I am having trouble to get correct information from the datasheet
Environment : AT89C51, Keil,
https://ww1.microchip.com/downloads/en/DeviceDoc/doc0265.pdf

I don't understand Which section/ page gives information to set UART?

Ian Rogers · Aug 31, 2020

The Atmel is a 8051 derivative ergo read the 8051 datasheet

http://lux.dmcs.pl/csII/8051.pdf page 19+ will help

Djsarkar · Aug 31, 2020

Ian Rogers said:
The Atmel is a 8051 derivative ergo read the 8051 datasheet

http://lux.dmcs.pl/csII/8051.pdf page 19+ will help

Where I can find original datasheet of AT89C51 ? I want to find out required information for Uart from the datasheet

Ian Rogers · Aug 31, 2020

The object of an 51 derivative is that its able to run code from the original set..

This is the nearest.. https://ww1.microchip.com/downloads/en/DeviceDoc/doc4180.pdf

Alsothis.. https://ww1.microchip.com/downloads/en/DeviceDoc/doc4316.pdf

Djsarkar · Aug 31, 2020

Ian Rogers said:
The object of an 51 derivative is that its able to run code from the original set..

This is the nearest.. https://ww1.microchip.com/downloads/en/DeviceDoc/doc4180.pdf

Alsothis.. https://ww1.microchip.com/downloads/en/DeviceDoc/doc4316.pdf

I think neither of them is the data sheet of my microcontroller.
I am sorry for not showing correct part in the firs post
I have AT89C512PI1503, Can you tell me the data sheet for this microcontroller?

sagor1 · Aug 31, 2020

That chip is still a AT89C51-24PI. The 1503 is just a date code. The -24PI is a version of the chip, 24Mhz, 40 pin DIP
Mouser has that chip, with a link to a datasheet:

https://www.mouser.ca/datasheet/2/268/doc0265-1180641.pdf

Pommie · Aug 31, 2020

Well done sagor1, so many knowledgeable people here.

Mike.

sagor1 · Aug 31, 2020

Actually, that "datasheet" is an abbreviated one, it does not show the UART details (I never checked it...)
The first link from Ian Rogers post #4 seems to have more details about each feature of the chip.

Djsarkar · Aug 31, 2020

deleted

Ian Rogers · Sep 1, 2020

WTF is TF0 The timer overflow flag is the ET0 flag Also you need to enable ALL interrupts with EA.
Check my example.. https://www.electro-tech-online.com/articles/simple-interrupts-on-the-8051.654/

Djsarkar · Sep 1, 2020

Ian Rogers said:
WTF is TF0 The timer overflow flag is the ET0 flag Also you need to enable ALL interrupts with EA.
Check my example.. https://www.electro-tech-online.com/articles/simple-interrupts-on-the-8051.654/

When you posted, I had edited my post because I got answer of my question.Your tutorial is awesome

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