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50 lines
809 B
50 lines
809 B
10 years ago
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;program cyklicky nacita z EEPROM adresy:0x00 hodnotu (0b00000101) a dava ji do PORTB.
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.include "tn13def.inc"
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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,low(RAMEND) ;nastavi stack pointer
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OUT SPL,r16
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LDI r16,0b00000111
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OUT DDRB,r16
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LOOP:
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LDI r17,0
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RCALL EEread
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OUT PORTB,r16
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RJMP LOOP
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;
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;EEread je funkce pro cteni z EEPROM
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;do r17 se ulozi adresa,
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;zavola se EEread
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;a v r16 se objevi hodnota, ktera je na adrese.
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EEread:
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SBIC EECR,1
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RJMP EEread ;cekani dokud neni EEPROM ready
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OUT EEARL, r17 ;ulozit adresu z r17
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SBI EECR,0 ;nastavenim EERE zacina cteni
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IN r16,EEDR ;cteni dat z EEDR do r16
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RET
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.eseg
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.org 0x00
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.DB 0b00000101
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