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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

absolute brain lapse

toozie21

New Member
So I have been updating some code of mine, and I went to put it on my PIC 16F877A and it isn't working. I've spent all evening tweaking and probing, and I can't get it to work. While I have been debugging things, I have started to second guess some other stuff, like when I program it, do I want it to be in HS or XT mode. I don't remember what I used to use. I have a 4MHz TTL crystal feeding into my PIC, but the datasheet seems a little unclear to me. Which would you go with for a 4MHz crystal?

Thanks a ton!
~Jason
 

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