Block Diagram of 8085

In: Computers and Technology

Submitted By akash111192
Words 1397
Pages 6
8/26/2010

Introduction to 8085
 It was introduced in 1977.
 It is 8-bit microprocessor.
 Its actual name is 8085 A.

BLOCK DIAGRAM OF
INTEL 8085

 It is single NMOS device.
 It contains 6200

transistors approx.
 Its dimensions are

GURSHARAN SINGH TATLA professorgstatla@gmail.com 164 mm x 222 mm.
 It is having 40 pins Dual-

Inline-Package (DIP).
1

Gursharan Singh Tatla professorgstatla@gmail.com www.eazynotes.com

2

Gursharan Singh Tatla professorgstatla@gmail.com Introduction to 8085


www.eazynotes.com

Introduction to 8085

It has three advanced versions: 

The advanced versions consume 20% less power supply. 

The clock frequencies of
8085 are:

◦ 8085 AH
◦ 8085 AH2
◦ 8085 AH1



These advanced versions are designed using HMOS technology. ◦ 8085 A

3 MHz
3 MHz
5 MHz
6 MHz

◦ 8085 AH
◦ 8085 AH2
◦ 8085 AH1

3

Gursharan Singh Tatla professorgstatla@gmail.com www.eazynotes.com

4

Gursharan Singh Tatla professorgstatla@gmail.com www.eazynotes.com

Three Units of 8085



Block Diagram of 8085

www.eazynotes.com

6

Instruction Unit



5

Processing Unit

Storage and Interface Unit

Gursharan Singh Tatla professorgstatla@gmail.com www.eazynotes.com

1

8/26/2010

Processing Unit

Instruction Unit





Instruction Register



Accumulator



Instruction Decoder



Status Flags



Timing and Control Unit



7

Arithmetic and Logic Unit

Temporary Register

Gursharan Singh Tatla professorgstatla@gmail.com www.eazynotes.com

8

Gursharan Singh Tatla professorgstatla@gmail.com Storage and Interface Unit

Three Other Units



General Purpose Registers



Interrupt Controller



Stack Pointer



Serial I/O Controller



Program Counter



Power Supply



Increment/Decrement Register



Address Latch


9

Address/Data Latch

Gursharan Singh Tatla professorgstatla@gmail.com www.eazynotes.com

10

Gursharan Singh Tatla…...

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