PIC ports

Community General Discussions
1

I'm having problems with 18f252 ports. I seem to be unable to control it as an input or an out but. Thus I am also unable to use the BTFSC or BTFSS controls. Is there a difference between the 16f and 18f series with regards to inputs and outputs?

EDIT

Sorry for the lack of info. I was in abit of a rush, I'm rushing now too :p

so the code i used is fairly simple :

The main part to control the 18f252 is ----> MOVLW B'00000000'

MOVWF TRISC ' THIS WILL MAKE IT AN OUTPUT RITE?

This is basically what i've got.

2

No major differences, the
No major differences, the architecture is very very similar.

3

I going more on the lines of
I going more on the lines of how to control the ports.

4

Can you post your code?
Can you post your code?

5

Please post code and
Please post code and schematics. Also, please describe what you have done to try and solve this problem, so we don’t waste time suggesting things that you have already tried

6

The architecture is how the
The architecture is how the ports are built, if they’re the same then the control methods are the same. Virtually all PIC micros speak the same language, word for word.

7

The code:MOVLW
The code:
MOVLW B’00000000’
MOVWF TRISC
will make all port C pins output pins, but only if ‘TRISC’ is properly defined, which I can’t tell from your code. It won’t set the state of the pins, but it will set them to output mode.

8

I used the simple include
I used the simple include command to define the portc and whatnots. What do you mean by state?

9

What was your source for the

What was your source for the include file? By state I mean 1/0, High/Low, etc.

10

I used the
I used the include<18252.inc> not very sure of the command as im using a different computer. So if i put all 1’s it would be an input? How do i ‘test’ the data from the input?

11

Yes, a 1 in the TRIS sets
Yes, a 1 in the TRIS sets the corresponding pin as an input. This info is in the datasheet.
You can test the input data in many, many ways. You can use the in-circuit debugger, make the PIC light up some LEDs, send data to an LCD display, etc.