Hi all,
Does anybody have any idea why internal pullups might be working on GPIO5 but not GPIO4 on a PIC12F675?
I have tried programming with PICKit1 and PICKit2 and on test boards with connections going nowhere GPIO5 works fine (5V) but GPIO4 has varying voltage below 1.3V. I have tried with 3 PIC chips. Have also tried in my circuit which has GPIO4 and GPIO5 going to ground via microswitches. I never get GPIO4 held high with internal pullup. Do I need to disable the Analog port somehow perhaps?Code:RESET clrf STATUS ; clrf GPIO ; Init GPIO movlw b'00000111' ; movwf CMCON ; comparator off, digital I/O bsf STATUS,RP0 ; bank 1 |B1 call h'3FF' ; get factory calibration value |B1 movwf OSCCAL ; set OSCCAL calibration value |B1 movlw b'00111000' ; Set 0,1,2 to outputs; 3,4,5 to inputs (switches) movwf TRISIO ; movlw b'00110000' ; Enable port 4,5 pullups movwf WPU ; Set Weak Pull Up register bcf OPTION_REG, 7 ; Enable Pull Ups bcf STATUS,RP0 ; bank 0 |B0
Regards,
David


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