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Join Date: Jul 2008
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Newbie Poster
HI all, I'm a newbie here. I need your help, does one of you know how is the code to countdown from 99 with 7 segment and atmel 89s51 or 89s52?
plz help me soon..
plz help me soon..
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Join Date: Dec 2005
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I'm sure some of us do, but we're not likely to just give it to you just because you ask.
See the intro threads, we don't give free homework.
Show us what you've managed so far, and then we'll help you with the next step.
See the intro threads, we don't give free homework.
Show us what you've managed so far, and then we'll help you with the next step.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
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Join Date: Oct 2006
Location: the Netherlands
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Why would you want to program it in assembly? AVR-studio can compile C for the 89s51. So the code would look like:
Without knowing how you connected everything, that's all I can tell you
c Syntax (Toggle Plain Text)
Want better/more replies to your questions? Wrap your code in [code] [/code] tags!
do NOT pm me for help, in the best case, you'll get ignored
do NOT pm me for help, in the best case, you'll get ignored
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Join Date: Sep 2006
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Posting Whiz in Training
Create a variable for units and a variable for tens.
Decrement the units variable, then pass each to a subroutine which checks its value and sends out the particular code. If the units variable is zero, it becomes nine and decrement the tens variable.
Decrement the units variable, then pass each to a subroutine which checks its value and sends out the particular code. If the units variable is zero, it becomes nine and decrement the tens variable.
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Join Date: Dec 2005
Posts: 3,639
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Meh, methinks you're wasting your fingers, since they've probably gone looking for free food elsewhere rather than actually risk learning something.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
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Join Date: Aug 2008
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Newbie Poster
Connect 2 seven segment displays on P0 & P2.
Initialize the R0 & R1 registers to 0.
Increment count for every second.
Use this circuit for Count down timer with AT89C2051
count.GIF
For More details visit my website
Initialize the R0 & R1 registers to 0.
Increment count for every second.
Use this circuit for Count down timer with AT89C2051
count.GIF
For More details visit my website
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Join Date: Sep 2006
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Posting Whiz in Training
The AT89C2051's output drops to 2.4V when it's output high is only 80uA. The base current of Q2 will never reach 1.9mA. The chip sinks 20mA so PNP transistors should be used.
Last edited by Colin Mac : Aug 2nd, 2008 at 9:00 am.
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Join Date: Aug 2008
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Newbie Poster
Thats a Good point, because 8051 micros drive the load only to ground.
In my circuit i have given pull up resistors for the pins which goes to the base of the transistors. So that the transistor works fine for me.
Anyway thanks for your advice, i will implement it and come back.
In my circuit i have given pull up resistors for the pins which goes to the base of the transistors. So that the transistor works fine for me.
Anyway thanks for your advice, i will implement it and come back.
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