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What I am doing is starting the counter at one pulse and stopping it at another.
And I calculate the time duration between it.
So it dosent matter if I write the code in C or in assembly? The time duration will remain same?
I am using timer in 8051. Somebody told me that timer control (measuring time between two pulses and such) in assembly is more accurate than using timer in C.
So now I am struck with displaying the number 1-100 using assembly.
I can do 1-9.
But what should be my logic to display 1-100 in...
Thanks for your clear explanation . Thats why people use phillips at89v51 chip. It contains a bootloader embedded inside it by phillips itself. So just hook up the at89v51 to max232 and thats it!
First I must using a ISP to load the bootloader in 89s52. Then only I can use the simple MAX 232.
So first using the LPT25 port, I insert bootloader in 89s52, then I can use the max 232.
Just asking, will rewriting the code via simple max232 transceiver will not erase the bootloader?
So the...
As you see in the figure, programming the 8051 through serial port DB9 connector should be a fairly easy task
Connect the two pins of 8051 to max 232 and then to DB9
So the programming circuit of 8051 should contain no more than 1 chip,some power sources,crystals,capacitors and one connector...
Basically I want to measure the kw,kvar and kva of the transmission line using microcontroller.
I am not saying give me the circuit(that would be helpful though:wink:), but please point me in right direction like
is it possible?
do we require to use A/D converter?
Is the buffer 74HCT541 really needed? The author in LINK 1 has shown a simple circuit without buffer though he has recommended buffer to be used for begineers. But the above circuit is very simple and I think the buffer adds unnecessary complications.
And I think both the circuits are for 89S...
Its not a hard question. I know many people have made circuit from the above links, I am just struck in between.
If you have made circuit, or have any info then please answer the question.
If my question requires further details or further clarification then tell me, I will post it.
I got struck between these two links that show circuit for programming 89SXX.
1. In LINK 1 this link, the pin number 23,12,10,9,7,5,2 are used of DB 25 connector.
While in this link, pins 5,6,7,8,9,10,18 are used of DB 25 connector.
So which one of the DB 25 version is correct? Or both are...
I followed the link that you gave and stumbled upon this link **broken link removed**
What I want to clarify that can I just take out wire from DB25 connector like that and connect it to specified port pin in 89s52 and program it?
I mean is it that easy? And am I wrong to think that that we can...
There is already a AT89C2051 in development board. So I am thinking of replacing with another 89C2051.
But I wanted to ask that is there some kind of program loaded in 89C2051?
And if I replace it with newer one, how will I program this 20 pin IC
I have a 8051 development board which contains AT89s52 chip.
I is programmed by a serial port.
Now the AT89s52 is programmed successfully but when I click on verify flash, it shows error.
Also I have to toggle the RESET/PROG button everytime. Like I click on read signature,it shows 0x1E 0x52...
I am making cycloconverter in transformer midpoint configuration (4 SCRs). The thyristors are line commutated and triggered by micrcontroller.
I simulated in multisim software, it works perfectly fine.
When I try to make connections in bread board, it dosent work. Only one thyristor triggers...
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