The 8051 Micro Controller and Embedded Systems CH1

·MICROCONTROLLERS

OBJECTIVES

Ube

os

it

nd ho

he

ho

in

~.

oc

tr ller ller

various

PROCESSORS

rp

general-purpose microprocessors

ROM'

CPU

General-

Serial

Purpose Microprocessor

COM

Port (a) General-Purpos

Microprocessor

System

po

(b Microcontr

ller

Home Appliances Intercom Telephcr ..es

Security system Garage door opener A.nsweringmachines Fax machines Home computers TVs Ca le TV uner VCR Camcorder Remote controls Vide games Cellular phone Musical instruments Sewing machines Lighting control Paging Camera Pinball machines Toys Exercise equipment Office Telephones Computers Security system FGX .uachine Microwave Copier Laser printe Color printe Paging

and off IBP. www.byte.com, lent discussion of microcontrollers). It

microcontroller,

ic

le embedded system Microprocessor

VUf-

microcontroller inside it that

1-1

products.

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Table 1-1: Some Embedded Products

c.

Using Microcontrollers

CHAPTE

1: TH

microcontrollers

Mme

Auto

Trip computer Engine control Ai ba ABS Instrumentation Security system Transmission control Entertainment Climate control Cellular phon Keyless entrv

an

8051 MICROCONT: OLLERS

ti

it main-

fP It must

th

ms embedded processo

high-end embedded processors Ver often and microcontroller ar used interchangeably.

110,

taining 110,

Choosing

ic ocontrolle

reliable

microcontroller

What is

ucts.

sumption versions

source

suppliers.

1 F Company Intel Atmel Philips/Signetics Siemens Dallas Semiconducto

www.intel.com/designlmcs51 www.atmel.com www.semiconductors.philips.com www.scr.siemens.com. www.dalsemi.com

Atrnel,

Ph_ilips/Signetics,

Dallas Semiconductor. It

.ivailability

1 M

Review Question sors.

3.

) R

al ) R

fo ) 1

) R

) R

) I

II

es

4.

embe de

yste

mean?

1-3:

patibl

it th

ri inal

05

8051 microcontrolle

as fa as he instruct on

ar

~F,; ,e~a ;;,;u; ,;r,;,e=== =~Q~ ~a~n ;,;t,;;,;it).!f:

Serial port Interrup source Note.

progra

ou space.

EXTERNAL INTERRUPTS ON-CHIP INTERRUPT

ROM for

1....:-_-

ETC.

ON-CHIP RAM

::

TIMER

--c: "U

/l

CPU

4110

BUS CONTROL

---'-

SERIAL PORT

PORTS

-r---.

ADDRESS/DATA

Figure 1-2. Inside th 8051

8052

icrocontroller Block Diagram

microcontroller

Table 1-4.:

8051 Fa il

er

8051

FeatureRA

Me

(bytes

.128

256

128

32_. Serial

or

fro..

Sl.DS-.:t .:-,!, i . l l < ~ ~0~2; th'_'/'

{ore,

803 microcontroller it :p

oI

Various 805

t4.

microcontroller

8751mtcrocontroller To

VY-

ro

re

AT89C5 from Atme Corporatio

\1

f f \ c o C o n\ . o \\ e - \J a se u

s ' s te m

1 ! C \ _u \ e s ROM butne(

T av I 1 -5 : V e rs io n

(All

J > l J r t Number

ROM

RAM

AT89C51 AT89LV51 AT89C 51

4K 4K IK

!·28 128

,H89LV52 Note:

8K

'las Timer

Interrupt

32 32

128

15

128 128

32

Vee

Packaging

5V 3V

40 40 20

-3

3V 3Y 5V

20 40 40

"C"

"C"

Use commercial commercial commercial

Packaging 2M 6M

D55000 fr

Dall

DI

40

plasti

Se ic nducto ~W51

is ro ra me Table 1-7: ar

mber

OS5000-8 OS5000-32 OS5000T-8 OS5000T-8

gain

8051

ROM

8K

ee

128

32 32 32 32

Notes:

''T''

CHAPTER

1: THE 8051 MICR

CONTROLLER

5V SV 5V

Packaging 40 40

40

Tabl

1-8: Vers on of 8051 ro NV-RAM

DS5000-8-8 DSSOOO-8-12 DS5000-32-8 DS5000T-32-8 DS5000-32-12 DS5000 -8-1

'0 TP versio

8K 8K 32K 32K 32K 8K

ilip

Questions

(a) 8 0 S 1

(b) 8 0 S 2

DS5000. 2P 2h

Speed

8MHz MHz '1 MHz

[/0,

Revie

conduc or

Hz

of th 80

05 fa il

alla Se

(wit

C)

with RT

SUMMARY ve da cr ce an co ol nt co pared. We di cussed th us of icrocontroller in th embedded arket. We also discusse criteria to consider in choo in ic ocontrolle such as peed emoac ag ng nd er ni ec nd ec on hi ch pt escr ed variou fa il me bers of th 8051 such as th 8052 an 8031 an thei eatures. 00

hi

ar

ed

up

er ot

an

el

PROBLEMS SECTIO

1.1: MICROCONTROLLERS AN or al e.

ge er

po

EMBEDDED PROCESSORS

crop ce or

ch

singl chip?

microcontro lIers ch choosin

ha

he

os

an ac

microcontroller?

matter? 13 ch ng that chip do 5. cr on

cr on

er ho

er pa er ar it tu of

ar

po pp ha bo

nt

av n? bi

on

F·\ vilLY

.T

E 8

urce

ip

it er on

urce or

hi

you

; \ I l '

dl'\i'

SECTIO~

1.1: MICRO(,ONTROLLERS

AN

EM EDDE

. A m

R OC ES SO R , (

~m

. (

SUi-i

1/0 ports. 2.

The ~l)52

on-chip

~, 3.

byte

BOL'1

(u

SK

5.

t~.lS: :a 8.

True

in th DS 00

It is NV-RAM

(c)

bytes