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Increase speed of PIC
Set OSCCAL to 0 and increment time loop,
test if „time loop“+1 fits into „1“ signal of DCC
Information about OSCCAL register in data sheet from Microchip is wrong!
Don‘t trust descriptions, see for yourself
Notizen:
The time loop for the iron-core version is 25µs long and I found no way to produce a loop with 22µs, therefore I increase the speed of the PIC.