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beaker404
Joined: 24 Jul 2012
Posts: 163
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 Posted: Sat Apr 15, 2017 8:43 am |
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| Quote: | haha..won't run out of pins.....lol !
really, you ALWAYS need 2-3 more.. |
Agreed, if I can I try to put 30% extra I/O. In this case, not much going on except the UART serial COM stuff so a 28 pin package would still have allot extra.
As I was reading the data sheet, it seemed I/0 functions could be moved around to basically any pin. I have not read all nearly 600 pages of the datasheet yet though. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Sun Apr 16, 2017 11:46 am |
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I get worse than this. Currently using some 100pin devices and still have to add some external extra PIC's to give extra pins & I/O....
Honestly though it is always worth going 'one chip larger' on any project, however many pins you initially allow, even if you go to the maximum the customer says they want, you can _guarantee_ that once they actually start using the device, they will miraculously work out extras that they will like. One skill is 'pre-guessing' this, and without being too obvious, always selecting a device that gives enough pins to cover the likely extras. |
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newguy
Joined: 24 Jun 2004
Posts: 1900
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| Posted: Sun Apr 16, 2017 12:25 pm |
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| It's my standard practice to build in a few extra inputs, outputs, maybe an expansion port.... On every single project/device I've done so, the customer has put them all to use within a few months. I never give the customer what they asked for - I always give them extra, mainly because I don't like doing things twice. |
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