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75 lines
1.2 KiB
75 lines
1.2 KiB
10 years ago
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;pokus
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.include "m16def.inc"
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.def POM=r16
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.cseg
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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 R16,0x5F ;nastavi stack pointer na 0x045F
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OUT SPL,R16 ;coz je konec SRAM u ATmegy16
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LDI R16,0x04
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OUT SPH,R16
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LDI POM,0xFF ;nastavi vsechny potrebne porty jako vystupni
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OUT DDRA,POM
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OUT DDRB,POM
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LOOP:
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LDI r16,0b01110111 ;display 3 abcef
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LDI r17,0b00001000
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OUT PORTA,r16
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OUT PORTB,r17
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RCALL cekani
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LDI r16,0b01110110 ;display 2
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LDI r17,0b00000100
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OUT PORTA,r16
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OUT PORTB,r17
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RCALL cekani
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LDI r16,0b00111111 ;display 1
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LDI r17,0b00000010
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OUT PORTA,r16
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OUT PORTB,r17
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RCALL cekani
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LDI r16,0b00011110 ;display 0
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LDI r17,0b00000001
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OUT PORTA,r16
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OUT PORTB,r17
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RCALL cekani
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RJMP LOOP ;jdi na 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, 2
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L1: DEC r16
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LDI r17, 2
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L2: DEC r17
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LDI r18, 2
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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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