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Lecture 1 introduction to microcontroller systems
1. ECE 265
Introduction to Microcontroller Based
Systems
(A first course in computer architecture)
9/28/2010
1
ECE265
2. Joanne E. DeGroat, OSU
Lecture Overview
Outline of the course
Syllabus
General guidelines and policies
A basic overview of computer architecture
The Von Neumann Architecture
The Harvard architecture
Microprocessors and Microcontrollers
9/28/2010
2
ECE265
3. Joanne E. DeGroat, OSU
The Syllabus
This is ECE 265 – Introduction to
Microprocessor Based Systems
Objective – A basic understanding of computer
architecture, specifically microcontrollers,
along with an understanding of the uses and
application of microcontrollers.
9/28/2010
3
ECE265
4. Joanne E. DeGroat, OSU
General guidelines and policies
Generally a quiz each week. Typically on Wednesday.
Quiz will not necessarily be announced each week.
Lowest Grade dropped.
NO MAKEUP QUIZZES
Homework due two classes after assigned. NO LATE
HOMEWORKS will be accepted. Homework will be
delivered to a dropbox in CARMEN. Dropbox will not
close but no submissions after due date will be
graded.
Midterm exam will be announced one week prior.
Final exam is during Finals Week
Monday March 12 11:30-1:18 in this room.
Other details on syllabus
9/28/2010
4
ECE265
5. Joanne E. DeGroat, OSU
A Basic Overview of Computer
Architecture
For your reference you can find much of this
information on Wikipedia.
But can you trust wikipedia?
When was the first computer created?????
9/28/2010
5
ECE265
6. Joanne E. DeGroat, OSU
Early computing technology
Early computing could be traced back to the
abacus. When was the abacus in use?
Around 2700 B.C.
In the mid 1600’s Blaise Pascal designed and
implemented a mechanical calculator.
Note: Today we use voltage level to represent a
logical TRUE and FALSE. There is no reason that
the physical position of a mechanical component
cannot do the same thing.
9/28/2010
6
ECE265
7. Joanne E. DeGroat, OSU
A little more modern
Charles Babbage 1792-1871
The Difference Engine
The Difference Engine 2
Basically a programmable calculator
Calculated artillery tables
The Analytic Engine – a more advanced machine
Used punch cards for input
A precursor to the modern computer
Boole 1815-1864
Boolean Algebra
9/28/2010
7
ECE265
8. Joanne E. DeGroat, OSU
Still, a little more modern
The von Neumann
architecture – 1940s
and 50s
A stored-program
computer that uses a
central processing
unit and a single
separate storage
structure that hold
both instructions and
data.
9/28/2010
8
ECE265
9. Joanne E. DeGroat, OSU
Basic operation of architecture
Instructions are executed
in sequence
First step during execution
MEM(PC) IR
Send contents of PC
(Program counter) to
memory
Memory responds with the
contents at that address
placing it on the data bus.
Increment the PC
(PC+1->PC)
The values on the data bus
are loaded into the
instruction register
9/28/2010
9
ECE265
10. Joanne E. DeGroat, OSU
Decode Instruction and execute
Say the instruction
was a load immediate
This means that the
next word in the
instruction stream is
the data that we want
loaded into the
accumulator
Operation is now
MEM(PC) Accum
Also increment the PC
9/28/2010
10
ECE265
11. Joanne E. DeGroat, OSU
More von Neumann
Earliest computers had fixed programs – such as
a desk calculator
The von Neumann architecture introduced the
concept of a stored program. In fact, in early
computers, they often wrote programs that self
modified.
Self-modifying code is now seen as a very bad
programming practice (also, it really isn’t needed).
von Neumann’s was very familiar with Alan
Turing’s (1912-1954) work – the Turing Machine
(1936).
Both von Neumann and Turing wrote papers on
stored program computers.
9/28/2010
11
ECE265
12. Joanne E. DeGroat, OSU
Some Early von Neumann
architectures
ORDVAC (U of Ill) - 1951
IAS machine (Princeton) - 1952
MANIAC I (Las Alamos) - 1952
ILLIAC (U of Ill) - 1952
AVIDAC (Argonne National Labs) – 1953
ORACLE at Oak Ridge Ntl Lab– 1953
JOHNNIAC at RAND Corp – 1954
BESK in Stockholm – 1953
PERM in Munich - 1956
9/28/2010
12
ECE265
13. Joanne E. DeGroat, OSU
Early Microprocessors
The Intel 4004 – 1971
16-pin DIP package
92,000 instructions per sec
10.8 microseconds per instruction
Processor had a small address space for data and a
small address space for instructions
Designed for use in calculators
Was the core element for the early electronic
calculators – early calculators did basic arithmetic.
Early microprocessors were often programmed in
assembler or machine code. Compilers and many
modern high level programming languages just didn’t
exist.
9/28/2010
13
ECE265
14. Joanne E. DeGroat, OSU
The Harvard Architecture
9/28/2010
ECE265
14
In the traditional von Neumann architecture
memory holds both programs and data
In the Harvard Architecture you have separate
memory spaces for data and programs. (term
that came into use during the late 1990s)
This is not really a new concept as the 4004
had separate data and program memory
address spaces.
15. Joanne E. DeGroat, OSU
Microprocessor vs.
Microcontroller
9/28/2010
ECE265
15
Basically a features issue.
Microprocessor – (the physical processor chip)
Composed of control unit, register, arithmetic and logic units
NO Memory, MaybeTimers, No direct external I/O ports
Does have pins for a data bus and an address bus
When implemented in a PC, add a keyboard for input, a monitor, a
mouse, a printer, etc.
Mircocontroller
Central core of microprocessor but limited capabilities in regards to
registers, memory size, and speed.
On board memory
Several Timers
I/O configurable ports
In implementation, may or may not have a keyboard, rather a
keypad/switches for input or other types of control, often does not have
monitor
16. Joanne E. DeGroat, OSU
Lecture summary
9/28/2010
ECE265
16
Have covered
What will be covered by this course and how the
course will operate
The syllabus, general guidelines and policies
An introduction to the history of computing –
computer are not new
The von Neumann architecture
Other architecture focuses
17. Joanne E. DeGroat, OSU
Assignment
9/28/2010
ECE265
17
What is a Turing machine?
HW1 - Write up what a Turing machine is and
how a Turing Machine executes a program.
(submit to dropbox HW1) Write 2/3 to 1 ½
pages.
Due dates on web page.
There are many sources for this assignment
Google web search
Wikipedia
Library