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Pertemuan 3 & 4Interface Mikroprosesor

secara Paralel

Matakuliah : H0194/ Aplikasi Mikroprosesor dan Interfacing

Tahun : 2005

Versi : <<versi/revisi>>

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Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa

akan mampu :

• Menjelaskan interface mikroprosesor secara parallel

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Outline Materi

• Komunikasi Paralel

• Paralel Port Interface

• Programmable Peripheral Interface

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Komunikasi Paralel

• Pengertian komunikasi paralel

• Metode komunikasi paralel

DATA

STB

STB

ACK

DATA

STB

ACK

DATA

(a)

DATA

(b)

(c)

(d)

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Paralel Port Interface

• Pengenalan Paralel Port

• Mode Operasi pada Standard Paralel Port:– Compatibility Mode– Nibble Mode– Byte Mode– EPP Mode– ECP Mode

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Paralel Port Interface

• Standard Paralel Port (SPP)

• Transfer Rate: 50 – 150 KB/s

STROBE

DATA[7:0]

BUSY

ACKNLG

PE

SLCT

AUTO FEED XT

ERROR

PrinterMicrocomputer

INIT

SLCT IN

GND

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Paralel Port Interface

• SPP Centronics Handshake

• SPP Port Address

• SPP Software Registers

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Paralel Port Interface

• Enhanced Paralel Port (EPP)

• Transfer Rate: 500KB/S – 2MB/s

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Paralel Port Interface

• EPP Handshake– Data write cycle– Address write cycle– Data read cycle– Address read cycle

• EPP Software Registers

• http://www.beyondlogic.org/epp/epp.htm

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Paralel Port Interface

• Extended Capabilities Port (ECP)

• DMA Enabled

• FIFO• Run Length

Encoding (RLE)

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Paralel Port Interface

• ECP Handshake– ECP Forward Data Cycle– ECP Forward Command Cycle– ECP Reverse Data Cycle– ECP Reverse Command Cycle

• ECP Run Length Encoding (RLE)• ECP Software Registers

– ECP Extended Control Register (ECR)– ECP Configuration Register A– ECP Configuration Register B

• http://www.beyondlogic.org/ecp/ecp.htm

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Programmable Peripheral Interface

• PPI 8255• Programmable I/O Device• Spesifikasi:

– Memiliki 3 Port 8-bit• Port A• Port B• Port C

– Memiliki 3 Mode Operasi• Mode 0 (Basic I/O)• Mode 1 (Strobed I/O)• Mode 3 (Bidirectional I/O)

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Programmable Peripheral Interface

• Blok Diagram– Group A

• Port A[7:0]• Port C[7:4]

– Group B• Port B[7:0]• Port C[3:0]

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Programmable Peripheral Interface

• Alamat dan control pada PPI 8255

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Programmable Peripheral Interface

• Control Word untuk mode operasi

Control Group A

Control Group B

Port C ( low order 4 bit )1 = input

0 = outputPort B

1 = Input0 = Output

Select Mode0 = mode 01 = mode 1

Port C ( high order 4 bit )1 = input

0 = outputPort A

1 = Input0 = Output

Select Mode00 = mode 001 = mode 110 = mode 21x = mode 3

Mode flag setting1 = enable

D7 D6 D5 D4 D3 D2 D1 D0

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Programmable Peripheral Interface

• Control Word untuk set/reset port C

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Programmable Peripheral Interface

• PPI 8255 Mode 0:

• Tidak ada fasilitas handshaking

• Masing-masing port hanya dapat dioperasikan sebagai input atau output saja

• Tersedia latch untuk output

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Programmable Peripheral Interface

• PPI 8255 Mode 1 (Strobed Input):

Sebagian pin Port C digunakan untuk , IBF, dan INTRSTB

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Programmable Peripheral Interface

• PPI 8255 Mode 1 (Strobed Output):

Sebagian pin Port C digunakan untuk , IBF, dan INTRSTB

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Programmable Peripheral Interface

• PPI 8255 Mode 2 (Strobed Bidirectional):

INTR

WR

OBF

ACK

STB

IBF

INTR

RD

RD WRData Bus