AN1175 - Pull-up and pull-down resistors in schematic on PGD and PGC
Both ICSP pins (DATA and CLK), RA0 and RA1, are connected to pull-up and pull-down resistors. Since these pins are used for programming by the PICkit™, is inserting jumpers to leave both ICSP pins away from the rest of the circuit suggested?
There are three suggested options:
- Pull down the potentiometer RV1.
- Put in jumpers, but it won't be possible to debug the program.
- It may be possible to use ICSP even without jumpers. For this, you can try to set the RV1 to the minimum value (so it has X kΩ between wiper and Vdd) during programming and eventually increasing R25 to a kΩ value may help. You can try to insert a resistor with kΩ values between V_U voltage divider and RA1_ICSP connection.