MENGENAL LOGIKA PENGARAH PORT MENGGUNAKAN BAHASA ASSEMBLY DAN MESIN

Substansi :

• PORT 90
• PROGRAM CONTROL TERBUKA
• Alamat Port 1/0
• Program Inisialisasi Port
• Flow Diagram Program
• Sistem Algoritma Program (Cara 1 & 2)
• Struktur Program (Cara 1 & 2).

PORT 90

Alamat Port 1/0

A1	A2	DATA	ALAMAT PORT
0	0	0	40 = Port A
0	1	1	41 = Port B
1	0	2	41 = Port C
1	1	3	43 = Register Control

A = 80

OUT (48), A

OUT (n), A

IN A, (n)

PROGRAM CONTROL TERBUKA

Program Inisialisasi Port :

1800    LDA, 80

1802    OUT (43), A

1804    LDA, FF

1806    OUT (40), A

1808    RST 0038

Hasilnya, maka seluruh indikator (LED) akan menyala, menandakan bahwa port-port normal. 

LED Sebagai Indikator Port

Flow Diagram Program

CARA 1

Algoritma Sistem Pengendali Port

Keterangan :

X  = inisialisasi port A = B = C = Out

Y  = data 1 = FF (daya akan dikeluarkan melalui port A)

Y’ = data 2 = 00

Z’ = tunda wakut FFFF

Struktur Program

Alamat	Assembly	Mesin
1800	LDA, 80	3E 80
1802	OUT (43), A	D3 43
1804	NOP	00
1805	LDA, FF	3E FF
1807	OUT (40), A	D3 40
1809	LDHL, FFFF	21 FF FF
180C	NOP	00
180D	NOP	00
180E	DEC L	2D
180F	JPNZ 1800	C2 00 18
1812	DEC H	25
1813	JPNZ 180C	C2 0C 18
1816	LDA, 00	3E 00
1818	OUT (40), A	D3 40
181A	LDHL, FFFF	21 FF FF
181D	NOP	00
181E	NOP	00
181F	DEC L	2D
1820	JPNZ 181E	C2 1E 18
1823	DEC H	25
1824	JPNZ 181D	C2 1D 18
1827	JPNZ 1804	C3 04 18

CARA 2

Sistem Algoritma Program

Subroutine

Struktur Program

Alamat	Assembly	Mesin
1800	LDA, 80	3E 80
1802	OUT (43), A	D3 43
1804	NOP	00
1805	LDA, FF	3E FF
1807	OUT (40), A	D3 40
1809	CALL UNC 1A00	CD 00 1A
180C	LDA, 00	3E 00
180E	OUT (40), A	D3 40
1810	CALL UNC 1A00	CD 00 1A
1813	JPUNC 1804	C3 04 18
1A00	LDHL, FFFF	21 FF FF
1A03	NOP	00
1A04	NOP	00
1A05	DEC L	2D
1A06	JPNZ 1A04	C2 04 1A
1A09	DEC H	25
1A0A	JPNZ 1A03	C2 03 1A
1A0D	RET UNC	C9