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Offline xavierTopic starter
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« on: December 13, 2009, 09:44:04 am »
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Help with PIC micro processor  Undecided

Why can?t I find any help with the signification of the pin out on pics? Angry
For example if I look at the PIC 18F2550 I see MCLR what dose it mean or RB0 to RB7 and so on here is another D-/VM can someone give me some insight on all this or is there a site that I can go to?

Hope to get some answer soon.  Smiley

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Xavier                                   


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So many questions so little time

Offline aquanut
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« Reply #1 on: December 13, 2009, 10:18:57 am »
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If you get no answer here, try

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http://www.treasurequestxlt.com/community/.


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Offline xavierTopic starter
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« Reply #2 on: December 13, 2009, 10:34:14 am »
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Hi Aquanut

Will do thanks but I do hope that there will be help over here too  Smiley

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So many questions so little time

Offline GoldDigger1950
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« Reply #3 on: December 13, 2009, 01:35:04 pm »
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The PIC chips all have spec sheets and application notes. The MCLR pin uses an RC timing tied to high to clear it after the first 5 machine cycles have completed and allows a clear memory in order to bootstrap the internal program. The pins labeled RB or RA or RC indicate registers and can either be an input or output depending on programming. Read the spec sheet to determine if a register is open collector or not because open collector inputs and outputs require a pull up resistor to function.

Learning to use a PIC chip will be an adventure you will never forget and a lifetime passion when you master them.

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Offline xavierTopic starter
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« Reply #4 on: December 13, 2009, 02:18:35 pm »
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Thanks GD

At least that?s a start the PIC 16F877A only has 230 or so pages of doc to read. So why do they put a crystal on the outside of the PIC when there is one in the PIC? And why are there so many power points on it are they for different applications or must they all be on +5v? And must all the grounds be connected? Is there not some sort of dictionary that explains all the different inputs and out? Surely there must be a common way of labelling these wonderful PIC?s or nobody would know what any body is doing any more?

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Offline GoldDigger1950
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« Reply #5 on: December 13, 2009, 02:35:06 pm »
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You ask too many questions, mate!  Grin

I'll try to answer them all. The internal oscillator is an RC oscillator and prone to drift so you can optionally use an external crystal or resonator. This is done for rock solid timing circuits. A register is set as an input, output or both by a programming command or, optionally, by a programming mask. The power pins all require the same power and cannot be mixed without a level shifter. In other words, you can't use 5v and then use 3.3v on another pin.

The use of pin nomenclature is the same throughout the PIC range and it is quite logical. There are guidebooks for them on the MicroChip web site. Also, see their design guide on their site. Learn the machine code first and then look towards higher level languages. The reason is simple. The machine code is native to the compiler and can be used embedded in higher level languages for those tasks that can only be accomplished at the machine level.

In every electronics circuit this side of the moon, all grounds of the same type must be connected. There are some isolated grounds like those used for logic that can be isolated from the earth grounds used for power.

Take a correspondence course in basic electronics. You won't be sorry.


Try this site:

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http://www.electronics-tutorials.com/basics/basic-electronics.htm


When you are ready for more advanced study, go here:

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http://www.microchip.com/


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« Last Edit: December 13, 2009, 02:44:22 pm by GoldDigger1950 »
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Offline xavierTopic starter
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« Reply #6 on: December 13, 2009, 05:22:05 pm »
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Good stuff Gold Digger thanks  Smiley I don?t know how they can put tutorials on the net saying that it?s meant for the bloke that is just starting out with PIC and not put this kind of info on there site?s MAN THAT MAKES ME MAD  Angry how the hell can you learn to programme the dam thing if you don?t understand why you have to do what they tell you to do.(like with the crystal) I will check out those links once again thank you.

Best regards
Xavier


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