Problem with BSF in a PIC assembler program...

[si2030]

Hi all,

I am new to all this but am having a go at learning it. I am working on a simple program to operate a LCD from a PIC16F877A microprocessor.

I am having trouble with these lines:

MOVLW H'30' ;SET LCD-DB4-RC4/DB5-RC5 HIGH - (FIRST).
MOVWF PORTC

BSF PORTC,LCD_E ;SET LCD_E = HIGH.
CALL WAIT_64MS
BCF PORTC,LCD_E ;SET LCD_E = LOW.

In particular the "BSF PORTC,LCD_E" line.

I have set "LCD_E" as "8" in the equates. By rights it should change PORTC from '00110000' to '00111000' but instead I am watching the file register to '00110001'.

The program compiles and all I wanted to do at this stage is check that all the registers are getting what they should but this has confused me.

I have included the program as it stands right now.

Kind Regards

Simon

 

[upand_at_them]

There is no bit 8, only bits 0-7.

 

[Gobbledok]

LOL yep that'll do it. You want to set bit 3 in the equates, not bit 8.

 

[si2030]

Ouch... that was pretty fundamental... thanks for pointing that out