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;
; $Id: test_cntr.asm,v 1.1 2001/11/21 22:04:45 troth Exp $
;
; Use simple opcodes to test the instruction decoder.
;
;;; .device AT90S8515
.include "8515def.inc"
;;; .cseg
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:
;; init stack pointer to 0x025f (the last byte of int sram)
ldi r16, 0x5f ; low byte of end of int sram
out SPL, r16
ldi r16, 0x02 ; high byte of end of int sram
out SPH, r16
ldi r16, 0xff ; initialize outer loop counter
LOOP1:
cpi r16, 0x00
breq DONE
dec r16
rcall INNER
rjmp LOOP1
INNER:
ldi r17, 0xff ; initialize inner loop counter
LOOP2:
cpi r17, 0x00
breq REPEAT
dec r17
rjmp LOOP2
REPEAT:
ret
DONE:
nop
|
