Internal Architecture And Pin configuration of 8085

Microprocessor

Prepared By:- Shraddha Aron (1401421065) EN-1

CONTENTS• Microprocessor• Internal architecture of 8085

microprocessor• Register structure• 8085 pin configuration• Address Bus• Control and Status signals

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CONTENTS

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• Power supply and clock frequency• Externally initiated signals and

interrupts• Serial I/O Port

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With the advancement of microelectronics technology, it become possible to integrate ALU, control circuits & memory on a single silicon chip. This IC chip is called microprocessor.

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8085MICROPROCESS-

OR

• The 8085 is an 8-bit general purpose microprocessor that can address

216 =64K Byte of memory. • It has 40 pins and uses +5V for power.

It can run at a maximum frequency of 3 MHz.

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INTERNAL ARCHITECTURE

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It consists of various functional blocks as listed below –

• Registers• Arithmatic and Logic Unit• Instruction Decoder & Machine cycle

encoder• Address Buffer• Address/Data Buffer• Incrementer/Decrementer Address

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• Interrupt Control• Serial I/O Control• Timing & Control circuitary

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REGISTER STRUCTURE

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8085 registers are classified as-General Purpose registersTemporary registers 1. Temporary data register 2. W & Z registers Sixteen bit registers 1. Program Counter 2. Stack Pointer

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Special Purpose registers 1. Accumulator 2. Instruction register 3. Flag registers

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8085 PINCONFIGURATION

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ADDRESS BUS

8085 has 16 signal lines that are used as address bus; however, these lines are split into two segments: and

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815 AA 07 ADAD

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CONTROL & STATUS SIGNALS

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This gp. of signals includes two control signals ( and ), three status signals(IO/ , and ) to identify the nature of the operation and one special signal (ALE) to indicate the beginning of the operation.

RD WR0S

M 1S 0S

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POWER SUPPLY AND CLOCK FREQUENCY

The power supply and frequency signals are as follows :-

CLK(OUT)

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CCV

SSV

21andXX

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EXTERNALLY INITIATEDSIGNALS AND INTERRUPTS

INTR RST 7.5, RST6.5, RST 5.5 TRAP HOLD HLDA READY

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INTA

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RESET OUT

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RESETIN

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SERIAL I/O PORT

8085 has two signals to implement the serial transmission: SID and SOD

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THANK YOU…

ANY QUERIES ?..

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