Keyboard interfacing the Propeller LED Display

AT89S2051 is different. I was actually talkin about P89V51RD2 anyways... you can surely replace C2051 with S2051. The ISP circuit are available online, check here:
http://dybkowski.net/content/en/node/15
http://ikalogic.com/isp.php

Ajay Bhargav

thanks for that.. Never thought it would be that easy! so we just have to connect those pins to the mosi, miso, sck & rst pins of the microcontroller?! Great!

Interrupts are an "add on".
The port works as usual, but you only see changes if you enable interrupts.
Other pins are more complex.
EG..if you enable the serial port, the TX/RX pins are controlled by the
serial hardware.
Actually I'm assuming that is the case
It may not always be true, but I never never tried to use a pin for two purposes
at once, it is hard enough doing one thing at once

ExperimenterUK

I was asking to make a continuity in the input port. I mean, P3.2 is being used as interrupt while propeller display is running. So, while inputting the new sequence, i can just disable that interrupt & use p3.0 to p3.5 & hence get the 6 input lines continuously. So then programming will be easy.

Use Proteus to build a test circuit... it saves a *lot* of time.

ExperimenterUK

Have heard of it, but haven't used it. Will check it out for sure.

Have heard of it, but haven't used it. Will check it out for sure.

nitheeshas

Search on forum you might be lucky make sure you dont get addicted to that software lol!

Search on forum you might be lucky make sure you dont get addicted to that software lol!

Ajay Bhargav

Use Proteus to build a test circuit... it saves a *lot* of time.

ExperimenterUK

man that software is really awesome! *no words to say*

The ISP circuit are available online, check here:
http://dybkowski.net/content/en/node/15
http://ikalogic.com/isp.php

Ajay Bhargav

About the programmer, i made the programmer shown in link below. I couldnt get 74LVC244 nor the AND gate ICs which were shown in the links you posted. I bought 74LS244, thinking it would be fine to use in circuit shown in the 1st link, but anyways, i searched for an ISP programmer that is using 74LS244 & got this link. You think it would be fine?


http://www.mytutorialcafe.com/Microcontroller%20Programmer%2089S51.htm

Also, i saw this line in the 2051 datasheet in the ISP section: "SCK frequency should be less than (XTAL frequency)/8."
How can we know the SCK frequency?

@ nitheeshas
yes this link is fine and it is working programmer
http://www.mytutorialcafe.com/Microcontroller%20Programmer%2089S51.htm

you can use 74LS244 in place of 74LVC244 as both are same function octal buffer with tristate output.

Thanks Majoka & Ajay bro. Built the S2051 programmer. But now, i cant find that microcontroller anywhere in the city i live at. One shopkeeper told they discontinued it. Is it true? Do you know any good online stores to buy it from India?

OR suggest some alternatives for S2051....

@ nitheeshas
u can use at89c2051
s2051 and c2051 is same things
see these attachments may be u find i t useful

@majoka: Thanks for that collection of programmers.
But the problem is that there isn't any 8051 programmers available for me, in order to burn the firmware to the master microcontroller(in Easy downloader). That is why Ajay bro advised me to use a microcontroller that supports ISP so that a simple programmer could be built, which dont require a master uC. I have only ATMEGA8 & ATMEGA8535 programmers. Do you know any C2051 programmers that are using these uC as master?
The USBASP uses ATMEGA8, but i think its for ISP supported microcontrollers only, right?

why dont u use ATMEGA in your project then??? wont that be good?

I thought about that, but i'm not confident in converting the assembly program to atmega compatible program. I have only done small programs with ATMEGA series. Also, i'm already lagging in submitting the project. So i just decided to fix with some 8051 microcontroller only. Anyways, I ordered S2051 from Robosapiens India just now.