I2C-Interface Philips Semiconductors / NXP Semiconductors, I2C-Interface Datasheet

I2C-Interface

Manufacturer Part Number

I2C-Interface

Description

Programming the 12C Interface

Manufacturer

Philips Semiconductors / NXP Semiconductors

Datasheet

1.I2C-INTERFACE.pdf (12 pages)

Current page: 1 of 12
Download datasheet (2Mb)

vtces desIgned

with other processor.

ductor),

cently Echelon’s INeuron chps. In all cas-

es, the goal is the same: to reduce the

wiring and pmcount necessary for a par-

allel data bus. It simply does not make

Mitch 1s a senior strategzc development

tween

Many semconductor

include

enguzeer for Intel and can be contact-

ed at 5000

dler AZ 85226

Philips Semiconductors

eral advantages

al interfaces

RS-232. Among

of 1% are multimaster

matic baud-rate

Jnd-play

Amencan engmeers

hit with an abundance

I say Amencan

tll recently the 12C bus was pnmanly

European

year,

Unite ,d States has risen dramatIcally.

Embe tdded systems

zmg

mgs-afforded

protocols.

zntel.com

ligent IC devices. The 1% bus offers sev-

The idea of serial Interconnect

,Mention the 1% bus to a group

12C Specific information

the cost. soace.

however,

integrated

Microwire

commumcation

he Inter-Integrated

(“1% Bus” for short) IS a two-

wire, synchronous,

face

SPI (~Motorolaj, and most re-

’

phenomenon.

network

W Chandler

by’robust

designed

such

to ?alk” via serial links

engmeers

or at mkabn@sedona.

adjustment,

the advanced

over ,.traditlonal”

Interest

clrcults

(Xatlonai

extensions.

and you’ll likely get

as LMicrowlre and

designers

vendors

Current exampies

and Dower sav-

operauon,

of blank stares.

se&l

between

Withm the last

pnmanly

m I‘C in the

Blud.. Cban-

because

IS not new.

serial inter-

Circuit Bus

and .‘plug-

Semcon-

When

mterchip

offer de-

are real-

features

auto-

intel-

seri-

un-

be-

for

intedigent devices need to communicate

cludes use of these architectures,

came about

challenge

of our managers

a consultant

er tar the Intel 8OCl86EB

processor.

economic

parallel bus to a slow penpherai.

capable

protocol

ture. For example,

chltectures

port. If your choice of architecture

your only opuon

protocol

1% protocol

The sobare

Unfortunately

EMBEDDED SYSTEMS

devices,

wdl dictate the CPU architec-

in software.

during a staff meetmg.

Being somewhat

sense

Mitchell Kahn

implement

to write a software 1% driv-

as a result of an ~mphclt

discussed

lmpiementatlon

proposed

to route a full-speed

for most serlal-bus-

the choice

IS to tmpiement

onlv two CPU ar-

an on-chip

m this article

that we hire

embedded

new to the

of a bus

of the

then

One

pre-

the

Programming the 12C Interface

curacvj

sledgehammer

ummg accuracv. The declslon to use as-

sembly tnstead of a high-level language

stemmed drectly from the need to con-

trol program-execunon

ther the tme nor the m&anon

tune high-level

sembly language,

lem: Could I make the code portable?

Intel offers a plethora

bedded-controller

it be possible to make the code some-

what portable

sembiv languages?

m the use of macros.

Three distmct tasks are mvolved m im-

of time, and driving the

came apparent

with creatmg the bus waveforms

normally

8OCl86EB’s on-chip timers. I could not,

however.

my code would be able to spare a urner

for the software 12C prt.

the elegance

timing loops. Luchlv,

IS extremely

verballv!) to his suggestIon.

of intense hacking later, I presented

dnver for general distnbutlon.

Design Tmde-offs

plementmg

the bus, waltmg for a spectiic amount

byte of a typical bus transaction:

Figure

group.

first prototype of the driver. My reward?

got to write a generic

Havmg made the decision

I took excepuon

1. The time delays

of the on-chip

Dr Dobb j-journal.

assume that the end users of

have been

the 12C protocol:

forglvmg

(and to some extent

between

code.

approach

when

architectures.

faced mv neaxt prob-

I found mv answer

relegated

the IlC protocol

ot CPU and em-

I flowcharted

time. I had ne;-

with regard

I had to forego

timers for the

version

(although

disparate

bus.

of software

.A weekend

associated

_fune 1992

to use as-

watching

This be-

to hand-

Would

would

to the

of the

see

as-

not

ac-

the

Related parts for I2C-Interface

I2C-Interface Summary of contents

Page 1

Philips Semiconductors 12C Specific information intedigent devices need to communicate When T he Inter-Integrated Circuit Bus (“1% Bus” for short two- wire, synchronous, serial inter- face designed pnmanly for commumcation between intel- ligent IC devices. The 1% bus ...

Page 2

Philips Semiconductors l*C Specific information AH the basic bu1ldmg blocks of thj I? protocol (watching, welting, and dc In9 can be compartmentalized into dk tmct macros. The algorithms that makl up the IlC driver are written with thesg macros as ...

Page 3

Philips Semiconductors 12C Specific information I polling of the SCL line that gives rise an importanc feature of 12C: automatit bit-by-bit baud-rate adjustment. Any df vice on the IzC bus may hoid the clot line low m order to stall ...

Page 4

Philips Semiconductors 12C Specific information the bu5 non on j The ma5ter broxica5ts the 5iave ad- dress md aspects XI ‘\CK from th .iddre55ed slave + The master recene5 0 or more bvte ot dam and \ends < ...

Page 5

Specific information erial data buses are a well- S proven tool in embedded systems. When you are com- municating with slow per- ipheral devices, serial buses are often often more convenient and less expensive than parallel buses. Addi- tionally, ...

Page 6

Semiconductors l*C Specific information Exploriizg 2 IC dressed. The added wiring offers no and the bus advantage to developers, of- fers nothing towards achievmg multi- pie-mastermg capabilities. One of the more versattle options available to developers IS the PC ...

Page 7

Philips Semiconductors l*C Specific information pullup reststor is external. Open-collector (actually, they are CMOS. so &open dram” is more appro- priate) contiguratron means that the output stage can only pull the node to ground. A passive resistor pulls the node ...

Page 8

Philips Semiconductors l*C Specific information Expbriig 2 IC ing as examples, the address is OlOOxxx. The xxx indicates the address selected by the state of the three address pins on the peripheral. PC serial transactions are always eight bits of ...

Page 9

Philips Semiconductors l*C Specific information Bit-Banging Serial Posts T hey say that necesstty IS the mother of inventron. and it certainly seems to be the case in embedded systems work. No sooner do you accomplish the tmposstble in one project ...

Page 10

Philips Semiconductors i*C Specific information The structures are referenced con- secutlvely. Each gves the source of a bit to be transmitted and a flag to indicate whether the pointer should be increased to point to a new bit. The transmission ...

Page 11

Philips Semiconductors l*C Specific information I internal RL41M. (Since was using the small model, this would have been the default storage anyway.) Index entry The in each structure al- lows the serial bit to be selected from an array of ...

Page 12

Philips Semiconductors 12C Specific information The previous transmitting code corn- plies. with only a Me manual assls- tance, to: TransEit = (bit)( transnnt BR_ptr-Findex BR_ptr-Unask ) WV DPL.BR_ptr+OlH MIV 0PH,Bfl_!~tr CLR A A.@A+DPlR WC ADD A,ntransmit KIV RO ...

Related keywords

I2C-Interface datasheet
I2C-Interface data sheet
I2C-Interface pdf datasheet
I2C-Interface component
I2C-Interface part
I2C-Interface distributor
I2C-Interface RoHS
I2C-Interface datasheet download