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88 lines
1.5 KiB
88 lines
1.5 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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.def A=r17
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.def B=r18
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.def C=r19
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.def D=r20
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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 porty jako vystupni
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OUT DDRA,POM
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OUT DDRB,POM
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OUT DDRC,POM
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OUT DDRD,POM
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LDI A,0b01110000 ;hodnoty portu A az D
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LDI B,0b10001000
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LDI C,0b10001000
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LDI D,0b00000111
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LOOP:
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CLC
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ROL A ;preroluj A registr
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BRCC ACC ;pokud je C=0, skoc na ACC (A Carry Clear)
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SBR A,0b00000001 ;nastav prvni bit v A na 1
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ACC: OUT PORTA,A ;output A do PORTA
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CLC
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ROL B ;preroluj B registr - totez co u A reg.
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BRCC BCC
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SBR B,0b00000001
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BCC: OUT PORTB,B
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CLC
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ROL C ;preroluj C registr - totez co u A reg.
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BRCC CCC
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SBR C,0b00000001
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CCC: OUT PORTC,C
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CLC
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ROL D ;preroluj D registr - totez co u A reg.
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BRCC DCC
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SBR D,0b00000001
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DCC: OUT PORTD,D
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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, 40
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L1: DEC r16
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LDI r17, 40
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L2: DEC r17
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LDI r18, 40
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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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