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BAB VI INTERFACE Up8088 DENGAN I/O

BAB VI INTERFACE Up8088 DENGAN I/O. Rizal suryana. Pendahuluan. Setiap perangkat Input dan Output akan memiliki alamat tersendiri untuk menandakan perangkat mana yang akan diakses oleh uP8088 Contoh Pengaksesan Input/Output MOV AL, 00H MOV 2FH, AL. Akses I/O terisolasi.

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BAB VI INTERFACE Up8088 DENGAN I/O

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  1. BAB VIINTERFACE Up8088 DENGAN I/O Rizal suryana

  2. Pendahuluan • Setiapperangkat Input dan Output akanmemilikialamattersendiriuntukmenandakanperangkatmana yang akandiaksesoleh uP8088 • ContohPengaksesanInput/Output • MOV AL, 00H • MOV 2FH, AL

  3. Akses I/O terisolasi • IN AL, F7H • IN AH, 00H • OUT F7H, AL • OUT 00H, AH

  4. Akses I/O Terpetakan • MOV AX, [00FFH] • MOV DX, [0000H] • MOV [00FFH], AX • MOV [0000H],DX

  5. Contoh Interface uP8088 dengan I/O

  6. Desain Decoder danJumlah Address Line • Fixed addressing + isolated IO • Fixed addressing + memory mapped IO • Variable Addressing + isolated IO • Variable addressing + memory mapped IO

  7. Fixed Addressing dan Isolated IO • Misalkan DIP Switch diaksespadaalamat 04H = (A7)0000 0100(A0)  IN AL, 04H • Instruksi IN akanmengaktifkansinyal RD (0 Volt) danSinyal IO (IO/M = 5 Volt • Nomor port 4 akanmemberikannilai yang sesuaipada address Line A0 – A7

  8. Fixed Addressing dan Memory Mapped IO • Sinyal IO/M tidakdiperlukan, Intruksinyamenjadi MOV AL, 04H • Tanpaadanyadekodingsinyal IO/M, makatidakakanadalagi yang membedakanantaraakseske IO denganMemori • Sinyal IO/M menjadibernilai 0 Volt

  9. Variable Addressing dan Isolated IO • Addressing Line yang dimasukanke decoder A0 – A15 • Intruksinyamenjadi : • MOV DX, 0004H • IN AL, DX

  10. Variable Addressing dan Mapped IO • Addressing Line yang dimasukanke decoder A0 – A15 • Tidakdiperlukanlagisinyal IO/M • Intruksinyamenjadi : • MOV DX, 0004H • MOV AL, DX

  11. Perangkat Output • Disiniakandigunakan D-FF (Data Flip-Flop) untukmenyimpan data keluaranuP 8088 agar datanyadapatdilihatterussampaidatanyaberubah • Mengaktifkan Flip-Flop denganmemberisinyal CLOCK

  12. OUT AL, #7FH • Instruksi OUT akanmengaktifkansinyal WR (0 Volt) danSinyal IO (IO/M = 5 Volt) • Nomor Port 7Fh akanmemberikannilai yang sesuaipada A0 – A7

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