Assembler help

[Juanse]

So, I can't seem to figure why my program doesn't work. It should receive a 4bit binarial number by portA and display it through portB coded for a 7 segment display, using RA4 and RA6 to turn the displays on, but I only get both displays on and 88 getting display, and a short If I put any bit on

TP6.asm

[Unimportant]

In "inicio":

	movlw	h'01'     
	movwf	TRISA

Moves literal hex value 01 to TRISA. In binary this is 00000001, thus this makes RA0 a input and all other PORTA pins outputs. This is probably not what you want if you need to receive a 4 bit value on PORTA ?

 

In "principal":

movlw	PORTA
movwf	temp

MOVLW means "Move literal to W" thus the above instruction moves the literal value "PORTA" (h'05' - the memory address of PORTA) to W, not the contents of PORTA. To copy the contents of PORTA to W use:

MOVF PORTA, W
MOVWF TEMP

 

 

[Juanse]

21 hours ago, Unimportant said:

In "inicio":

	movlw	h'01'     
	movwf	TRISA

Moves literal hex value 01 to TRISA. In binary this is 00000001, thus this makes RA0 a input and all other PORTA pins outputs. This is probably not what you want if you need to receive a 4 bit value on PORTA ?

 

In "principal":

movlw	PORTA
movwf	temp

MOVLW means "Move literal to W" thus the above instruction moves the literal value "PORTA" (h'05' - the memory address of PORTA) to W, not the contents of PORTA. To copy the contents of PORTA to W use:

MOVF PORTA, W
MOVWF TEMP

 

 

Thanks dude! I'll test it tomorrow and advice you!