Patrick Fitzgerald
Published

ATtiny Assembler Program

Program an ATtiny13 development board with AVR assembly language.

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ATtiny Assembler Program

Things used in this project

Hardware components

artou attiny13 development board
×1
M5Stack ISP USBasp Programmer (Random Color)
M5Stack ISP USBasp Programmer (Random Color)
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Software apps and online services

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Microchip Studio

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Code

count.asm

Arduino
AVR assembler program to do a binary count on PORTB
ATtiny13 - you may need to change filename to count.asm
.include "tn13def.inc"
    .def	mask 	= r16	; mask register
    .def	ledR 	= r17	; led register
    .def	oLoopR 	= r18	; outer loop register
    .def	iLoopRl = r24	; inner loop register low
    .def	iLoopRh = r25	; inner loop register high
    .equ	oVal 	= 80	; outer loop value
    .equ	iVal 	= 800	; inner loop value
    .cseg
    .org	0x00
    clr	    ledR		; clear led register to zero
    ldi	    mask,0xFF		; load the mask register 11111111
    out	    DDRB,mask		; set PORTB to all 8 bits OUT
start:
    out	    PORTB,ledR		; write led register to PORTB
    inc     ledR		; increment ledR from 0 to 255
    ldi     oLoopR,oVal		; initialize outer loop count
oLoop:
     ldi    iLoopRl,LOW(iVal)	; intialize inner loop count in inner
     ldi    iLoopRh,HIGH(iVal)	; loop high and low registers
iLoop:
    sbiw    iLoopRl,1	        ; decrement inner loop register
    brne    iLoop		; branch to iLoop if iLoop register != 0
    dec	    oLoopR		; decrement outer loop register
    brne    oLoop		; branch to oLoop if outer loop register != 0
    rjmp    start		; jump back to start

Credits

Patrick Fitzgerald

Patrick Fitzgerald

49 projects • 19 followers

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