Summary of The internal hardware configuration of the 8051

Summary

The internal hardware configuration of the 8051 registers and control circuits have been examined at the functional block diagram level. The 8051 may be considered to be a col­lection of RAM, ROM, and addressable registers that have some unique functions.

SPECIAL-FUNCTION REGISTERS

Register

Bit

Primary Function

Bit Addressable

A

8

Math, data manipulation

Y

B

8

Math

Y

PC

16

Addressing program bytes

N

DPTR

16

Addressing code and external data

N

SP

8

Addressing internal RAM stack data

N

PSW

8

Processor status

Y

P0-P3

8

Store I/O port data

Y

TH0/TL0

8/8

Timer/counter 0

N

TH1/TL1

8/8

Timer/counter 1

N

TCON

8

Timer/counter control

Y

TMOD

8

Timer/counter control

N

SBUF

8

Serial port data

N

SCON

8

Serial port control

Y

PCON

8

Serial port control. user flags

N

IE

8

Interrupt enable control

Y

IP

8

Interrupt priority control

Y

DATA AND PROGRAM MEMORY

Internal

 

Bytes

Function

 

RAM

 

128

RO- R7 registers, data storage, stack

 

ROM

 

4K

Program storage

 

External

 

Bytes

Function

 

RAM

 

64K

Data storage

 

ROM

 

64K

Program storage

 

EXTERNAL CONNECTION PINS

                          Function

Port pins 36 I/O, external memory, interrupts

Oscillator 2     Clock

Power 2

Leave a comment

Your email address will not be published. Required fields are marked *