beep.asm  http://www.talkingelectronics.com/projects/5x7Display/Display_08_Piezo_experiments_page1.html         
  Start     ORG 0x00
              BSF 03,5              ;Go to page1 for setting-up the ports 
              MOVLW 00h        ;Put 00 into W 
              MOVWF 05h        ; to make all RA lines output 
              MOVWF 06h        ;to make all RB lines output
              BCF 03,5              ;Go to Page0 for programming 

 Tone1   BSF 06,7              ;this  is the  piezo line.  Turn it ON
              CALL Delay          ;Call Delay
              BCF 06,7              ;Turn off the piezo
              CALL Delay          ;Call Delay
              GOTO Tone1        ;Repeat the routine
 Delay    DECFSZ 1Ah,1     ;Delay for tone
              GOTO Delay 
              RETURN 

              END

beep.hex
:100000008316003085008600831286170A20861327
:0A0010000A2005289A0B0A280800B0
:00000001FF