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;
; $Id: test_port.asm,v 1.2 2001/10/21 21:24:05 troth Exp $
;
;;; Test basic functionality of reading and writing to
;;; the io ports.
;
;.device AT90S8515
.include "8515def.inc"
.equ zero, 17 ; r17 preset with 0x00
.equ ones, 18 ; r18 preset with 0xff
;;; Interrupt Jump Table
rjmp MAIN ; reset
nop ; int0
nop ; int1
nop ; timer1 capt
nop ; timer1 compa
nop ; timer1 compb
nop ; timer1 ovf
nop ; timer0 ovf
nop ; spi, stc
nop ; uart, rx
nop ; uart, udre
nop ; uart, tx
nop ; ana_comp
MAIN:
;; preload zero and ones
ldi zero, 0x00
ldi ones, 0xff
;; init portb for output
out DDRB, ones
out PORTB, zero
;; init portd for input
out DDRD, zero
LOOP1:
in r16, PIND ; read from PORTD to R17
out PORTB, R16 ; write R16 to PORTB
rjmp LOOP1
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