Hey, it would be real nice if someone could show me how one note could be made let's say "Do". i did find a program but i don't quite understand how it works.. (piezo buzzer used for sound)

(variables)
CBLOCK H'0C'
CNT
CNT10
CNTM
ENDC


10MSEC

;***********************************************
DEL10M MOVLW 10
MOVWF CNT10

DLY10 MOVLW 142
MOVWF CNTM

DLYU GOTO $+1
GOTO $+1

DECFSZ CNTM,1
GOTO DLYU
DECFSZ CNT10,1
GOTO DLY10

RETURN
;**********************************************

DO_ BSF PORTA,3
MOVLW 67
MOVWF CNT
CALL DLY
GOTO $+1
GOTO $+1
NOP
BCF PORTA,3
MOVLW 67
MOVWF CNT
CALL DLY
GOTO $+1
BTFSS PORTB,0
GOTO DO_
RETURN

 

Forgot the delay program, here:
DLY GOTO $+1
GOTO $+1
DECFSZ CNT,1
GOTO DLY
RETURN

 

First thing to sort out is what frequency is 'Do'?
Then can calculate the period of the note - (1/frequency), call it P - then you set a pin high, wait P/2, set the pin low, wait P/2, and repeat until bored.

 

This might help with the frequencies and is fun to play with too: https://www.szynalski.com/tone-generator/

Years ago, a good friend gave me this code for a 10F2xx chip (base level). It should be adaptable to your chip easily and you can see how to make individual notes. Sorry to have to add as a edit, it took awhile to find.

Of course, just change the extension to .asm and it should open fine in your IDE.

 

Every MCU has a timer module. Use this to generate square wave output at your desired frequency.

 

Maybe you know this already but the tone (DO in your case) will have a huge amount of harmonics. Far from a nice sound.

Good luck.