eee410_lecture15 - EEE 410 Microprocessors I Spring 04/05...

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1 EEE 410 – Microprocessors I Spring 04/05 – Lecture Notes # 15 Outline of the Lecture Basic Computer Architecture B ASIC C OMPUTER A RCHITECTURE CPU : Central Processing Unit/Microprocessor; the Brain and the Heart of the Computer. Executes (processes) the information stored in memory. Memory : Memory is the primary storage for the programs and data (RAM, ROM) I/O : - Drives the disks (secondary storage units):Hard Disk, Floppy Disks etc. - Monitor (CRT – Cathode Ray Tube ) - Keyboard - Printer - Mouse - Fax, Modem Buses : A bus is defined to be a bundle of wires. There are 3 types of buses - Address Bus (Unidirectional) - Data Bus (Bidirectional) - Control Bus (Unidirectional) CPU Microprocessor 80x86 Memory (RAM,ROM) I/O Device Input/Output (Keyboard) I/O Device Input/Output (Monitor) Data Bus Address Bus Control Bus
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2 Time Sequencing during an instruction execution CPU Control Unit Registers ALU C o n t r o l U n i t . Memory . . Control Bus Address Bus Data Bus Fetch an instruction Decode Execute Generate READ / WRITE during execution Upgrade Program counter READ READ or WRITE CPU Memory
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3 Pin descriptions of 8086 Microprocessor Data Bus: - In 8086 microprocessor Pins AD0 – AD15 are used for the data bus. - However the same pins are also used for Address bus as well. - The ALE (Address Latch Enable –pin 25) signals whether the information on pins AD0 – AD15 is used address or data. -
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eee410_lecture15 - EEE 410 Microprocessors I Spring 04/05...

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