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54 lines
865 B
54 lines
865 B
10 years ago
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;pokus
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.include "tn13def.inc"
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.def POM=r16
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.org 0x0000 ;zacatek kodu
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RJMP RESET ;skok na start po resetu
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.org 0x0010 ;zacatek vlastniho programu
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RESET:
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LDI POM,low(RAMEND) ;nastavi stack pointer
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OUT SPL,POM
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LDI POM,0B00000011 ;nastavi vystupni piny
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OUT DDRB,POM
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LOOP:
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SBI PORTB,0 ;PB0=0, PB1=1
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CBI PORTB,1
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RCALL CEKANI ;CEKACI SUB
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CBI PORTB,0 ;PB0=1, PB1=0
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SBI PORTB,1
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RCALL CEKANI ;CEKACI SUB
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RJMP LOOP ;znovu na navesti LOOP
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CEKANI:
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PUSH r18 ;ulozit pouzivane registry do STACKU
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PUSH r17
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PUSH r16
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LDI r16, 100
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L1: DEC r16
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LDI r17, 100
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L2: DEC r17
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LDI r18, 125
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L3: DEC r18
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CPI r18, 0
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BRNE L3
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CPI r17, 0
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BRNE L2
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CPI r16, 0
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BRNE L1
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POP r16 ;nacist puvodni obsah registru ze STACKU
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POP r17
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POP r18
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RET ;navrat do hlavniho programu
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