Three input NOR gate in PIC

[Noel Philip]

Hey guys,

I was wondering if  i could get some help with an assignment question we were given (in a very short span of time),The question is as follows :”Implement a three input NOR gate in PIC.Input pins are 33,35 and 37.(Connect three switches to input the biits) and the output pin is 21(connect an led to indicate the output)

I tried using a simple code as follows,but when i check for a change in the SFRs during line wise debugging,I dont get a change as expected.

CONFIG OSC = HS , OSCS = OFF

CONFIG WDT = OFF

CONFIG BORV= 45, PWRT = ON ,BOR = ON

CONFIG DEBUG = OFF ,LVP =OFF ,STVR = OFF

#INCLUDE <P18F452.INC>

ORG 00H

BCF TRISD,0

SETF TRISB

MOVLW B’10101000′

MOVWF PORTB

BTFSS PORTB,7

BSF PORTD,0

BTFSS PORTB,5

BSF PORTD,0

BTFSS PORTB,3

BSF PORTD,0

END

 

Do advice

 

[AJISH ALFRED]

Do you have a C code of the same? Could you please explain the logic which you are using in the code?

[Ashutosh Bhatt]

I dont see any conditional instructions in ur code
I dont know any assembly language but
the logic is u hv to use conditions like
if else or case

[Author]

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