Programming the 8085
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Tuesday, September 21, 2010
Square wave with 90 degree phase shift using 8255
4100 3E 80 LOOP: MVI A,80H 4102 D3 0F OUT 0FH 4104 3E FF MVI A,0FFH 4106 D3 0C OUT 0CH 4108 CD 20 41 CALL DELAY 410B D3 0D OUT 0DH 410D CD 20 41 CALL DELAY 4110 3E 00 MVI A,00H 4112 D3 0C OUT 0CH 4114 CD 20 41 CALL DELAY 4117 D3 0D OUT 0DH 4119 CD 20 41 CALL DELAY 411C C3 00 41 JMP LOOP 411F 76 HLT 4120 06 30 DELAY: MVI B,30H 4122 05 WAIT: DCR B 4123 C2 22 41 JNZ WAIT 4126 C9 RET
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