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  #1  
Old 12-30-2009, 03:05 PM
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Default Frequency Counter Design

hi all

i have a homework to design a frequency counter as follows:

1- The design must have a keypad as an input,and seven segment to display the frequency on it(output).
2-The input wave could be square,sin wave....
3- I must use concepts of 8088,8255,8254 in designing the counter
4-Microcontrollers or ready IC's are not allowed in the design
5-In the final report i should show the design with comments,flowchart,and the assembly code used to run it.

I am not too much into microprocessor interface so if anyone can help me it will be great..

THX
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  #2  
Old 12-30-2009, 03:07 PM
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What does your circuit look like so far? Post your diagram here. Maybe we can guide you through the rest of the design.

hgmjr
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Old 12-30-2009, 03:09 PM
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i really didnt make a circuit yet,actually computer engineering is not my major,so i dont know how to start,can you guide me on ideas how to choose a good circuit to work?
thank u for ur fast reply
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Old 12-30-2009, 03:34 PM
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Start by reading up on the 8088. It's not going to be an easy project with that old microcomputer, it's more a task for a microcontroller.
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Old 12-30-2009, 03:56 PM
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I already drew this block diagram (attached) ,but i don't know how to start the assembly code
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File Type: jpg Frequency Counter Block-Diagram.JPG (22.6 KB, 39 views)
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Old 12-30-2009, 04:00 PM
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The block diagram is a good beginning. Don't forget to account for the power supply.

Now you can begin to take a stab at designing each of the blocks you have indicated in your diagram.

hgmjr
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Old 12-30-2009, 05:29 PM
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When's it due?

The 8088 will need at the very least external ROM & RAM plus a clock generator IC.
It's a really poor choice for a frequency counter project.
http://sasteven.multics.org/8088page.html
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Old 12-30-2009, 06:19 PM
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It's pretty simple to make one with a timebase, some logic, and some counters.

School projects are supposed to be instructive, though. This is a not-too-terribly-difficult project that will teach hardware functions, I/O, and programming. Too bad it's a stinky 8088 instead of a 6502 or a 6800.
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