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The only pin that needs a pull-up is the reset pin. Whether or not the other pins need them depends on the surrounding circuitry. Reset can also be pulled up or down by other components, it depends on the application.
Hi,
PORTB has internal pull-ups and these can be implemented. Other ports don't have pull-ups so if there is a necessity of pull-ups on the other ports then they need pull-ups (external resistors).
No port NEEDS pull-ups, it depends on your circuit. If there is a need for pull-ups on PORTB, you have internal pull-ups so they don't need EXTERNAL pull-ups, but if you need pull-ups on other ports then you need EXTERNAL pull-ups.
Hope I could make myself clear and that this helps.
Tahmid.
Dear 5282604,
PORTB for PICs with 40 pin have internal pull up resistors as i have posted above can be enabled by clearing the MSB of the OPTION REGISTER. All other ports i.e PORTA,PORTC,PORTD & PORTE require external pull up resistances which have to be connected manually for operating the device connected to the corresponding ports.
As you have asked above PORTA doesn't have internal pull up resistors & we'll have to manually connect the external resistors to the PORT we require other than PORTB.
Regards,
Jerin. ;-)
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