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LDmicro Forum - PIC16F628 internal oscilator

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PIC16F628 internal oscilator (by Edward )
Hello,
I'm trying to build an 8-input, 8-output PLC using the PIC 16F628A.
Please, Does anyone know, how to use the internal oscillator to free up RA6/OSC1 and RA7/OSC2?
I also want to free up RA5/MCLR to use as an input.
Thanks in advance.
Sun Jan 18 2026, 22:41:05
(no subject) (by MGP)
I think this should work.
Mon Jan 19 2026, 02:53:32, download attachment 16F628a_4Mhz_INTOSC.ld
(no subject) (by Edward )
Greetings MGO,
Thanks for your reply.
I can't open the file 16F628a_4Mhz_INTOSC.ld.
What could be the reason?
Mon Jan 19 2026, 14:40:37
(no subject) (by MGP)
You need version 5.4.1.1 or higher of LDmicro.
You can download the latest version (V5.4.1.2) here.

https://cq.cx/ladder-forum.pl?...parent=11953&tt=1768751910

If you use Win11, you should use the Win11_Home version, as there seem to be problems with other versions.
Mon Jan 19 2026, 15:26:00
(no subject) (by Edward)
Okay.
Now I can try it.
I'll be commenting soon.
Thank you very much.
Mon Jan 19 2026, 21:41:06
(no subject) (by Edward)
It worked.
MGP, thank you very much.
Wed Jan 28 2026, 21:12:01
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