Atmel and pic microcontroller

Mar 7, 2013Download as PPTX, PDF2 likes4,850 views

This document provides an overview of microcontroller programming using C language for ATMEL and PIC microcontrollers. It discusses microcontroller architecture, including the central processing unit, memory, timers/counters, and interrupts. It then introduces the ATMEL 89C2051 microcontroller, describing its pin configuration, special purpose I/O, memory, and other features. The document outlines the structure of microcontroller C programming and provides sample programs to blink an LED. It also discusses configuring the hardware and software environment, compiling and burning programs to the microcontroller, and writing interrupt subroutines.

ATMEL and PIC Microcontroller
Programming
using
C language
Presented by:
Engr. Tirso L. Llantada, ECE

Overview
• Introduction to Microcontrollers
• Hardware Configuration
• Microcontroller Programming

What is a Microcontroller
(MCU)
• It is a single chip microprocessor system
which contains data and program memory,
serial and parallel I/O ports, timers, external
and internal interrupts, ALL integrated into a
single chip.

Central Processing Unit(CPU)
vs
Microprocessor Unit(MPU)
vs
Microcontroller Unit(MCU)

Central Processing Unit
• this could refer to the actual processor part of a
microcontroller, the microprocessor within a
computer, or the processor "box" of a computer
system.
Microprocessor Unit
• This devices tend to be aimed at computer
applications.
Microcontroller Unit
• This devices tend to be aimed at embedded control
applications
• They tend to consist of a processor plus a number of
useful peripherals (MMU, Timers, watchdog, A/D, etc,
etc, etc).

Microcontroller Architecture
EEPROM
RAM
ROM

Serial
Other Peripherals Microprocessor Communications
(RS232)

Analog Digital
I/O I/O

What you need to know!
• Before you can make a working microcontroller
project, you should first know the following:

1. Supply Voltage
2. Number of I/O
3. Special Purpose I/O(Serial Ports, ADC Ports, etc)
4. Memory(RAM and ROM)
5. Timers/Counters
6. Interrupts
7. XTAL Oscillator frequency

 Supply(VCC,GND)- 2.7V to 6V Operating Range
Pin  I/0pins:
o Port 1 - The Port 1 is an 8-bit bi-directional I/O port. The
Configuration Port 1 out-put buffers can sink 20 mA and can drive LED
displays directly.
o Port 3 - Port 3 pins P3.0 to P3.5, P3.7 are seven bi-
directional I/O pins with internal pull-ups.
 Special Purpose I/O
o P3.0 RXD (serial input port)
o P3.1 TXD (serial output port)
o P3.2 INT0 (external interrupt 0)
o P3.3 INT1 (external interrupt 1)
o P3.4 T0 (timer 0 external input)
o P3.5 T1 (timer 1 external input)
 Memory(2Kbytes)
 Timers/Counters - 2 16-bit timer/counter
 Interrupts(6 sources of interrupts)
o Reset, Timer 0 overflow, Timer 1 overflow,
External Interrupt 0, External Interrupt 1, Serial
Port events (buffer full, buffer empty, etc)

 XTAL frequency - 0 Hz to 24 MHz

Microcontroller Programming
• Traditionally, it can only be programmed using
assembly language.
• But due to the complexity of assembly
language, high level language were developed
such as BASIC and C Programming

Microcontroller Programming
using C language

Structure of Microcontroller C Programming

$Sample Programs #include<AT892051.h> /*Function to delay about a second void wait_a_sec() { Unsigned int x; for(x=0;x<33000;x++); } /*start of main program*/ main() { int LED = 1; for(;;) { P1=~LED; LED++; wait_a_sec(); } }$

Oops! First we
configure!
• Select
Project – Components,
Environment, Books

Configuration
• Set the following parameters

Compiling the
Project
• Select
Project – Build target

Check Status
Window
• There should be
0 errors and
0 warnings

Interrupt Subroutines
1. Interrupt subroutine for timer 1
Void timer1() interrupt 3
{
Interrupt service code goes here
}
2. Interrupt subroutine for timer 3
Void timer0() interrupt 1
{
Interrupt service code goes here
}

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Atmel and pic microcontroller

1. ATMEL and PIC Microcontroller Programming using C language Presented by: Engr. Tirso L. Llantada, ECE

2. Overview • Introduction to Microcontrollers • Hardware Configuration • Microcontroller Programming

3. What is a Microcontroller (MCU) • It is a single chip microprocessor system which contains data and program memory, serial and parallel I/O ports, timers, external and internal interrupts, ALL integrated into a single chip.

4. Central Processing Unit(CPU) vs Microprocessor Unit(MPU) vs Microcontroller Unit(MCU)

5. Central Processing Unit • this could refer to the actual processor part of a microcontroller, the microprocessor within a computer, or the processor "box" of a computer system. Microprocessor Unit • This devices tend to be aimed at computer applications. Microcontroller Unit • This devices tend to be aimed at embedded control applications • They tend to consist of a processor plus a number of useful peripherals (MMU, Timers, watchdog, A/D, etc, etc, etc).

6. ALU Control Unit

7. ARE WE CLEAR?

8. Microcontroller Architecture EEPROM RAM ROM Serial Other Peripherals Microprocessor Communications (RS232) Analog Digital I/O I/O

9. Microcontroller Architecture

10. What you need to know! • Before you can make a working microcontroller project, you should first know the following: 1. Supply Voltage 2. Number of I/O 3. Special Purpose I/O(Serial Ports, ADC Ports, etc) 4. Memory(RAM and ROM) 5. Timers/Counters 6. Interrupts 7. XTAL Oscillator frequency

11. INTRODUCING ATMEL 89C2051

12.  Supply(VCC,GND)- 2.7V to 6V Operating Range Pin  I/0pins: o Port 1 - The Port 1 is an 8-bit bi-directional I/O port. The Configuration Port 1 out-put buffers can sink 20 mA and can drive LED displays directly. o Port 3 - Port 3 pins P3.0 to P3.5, P3.7 are seven bi- directional I/O pins with internal pull-ups.  Special Purpose I/O o P3.0 RXD (serial input port) o P3.1 TXD (serial output port) o P3.2 INT0 (external interrupt 0) o P3.3 INT1 (external interrupt 1) o P3.4 T0 (timer 0 external input) o P3.5 T1 (timer 1 external input)  Memory(2Kbytes)  Timers/Counters - 2 16-bit timer/counter  Interrupts(6 sources of interrupts) o Reset, Timer 0 overflow, Timer 1 overflow, External Interrupt 0, External Interrupt 1, Serial Port events (buffer full, buffer empty, etc)  XTAL frequency - 0 Hz to 24 MHz

13. Hardware Configuration RS232

14. Microcontroller Programming • Traditionally, it can only be programmed using assembly language. • But due to the complexity of assembly language, high level language were developed such as BASIC and C Programming

15. Microcontroller Programming using C language

16. Structure of Microcontroller C Programming

17. Sample Programs #include<AT892051.h> /*Function to delay about a second void wait_a_sec() { Unsigned int x; for(x=0;x<33000;x++); } /*start of main program*/ main() { int LED = 1; for(;;) { P1=~LED; LED++; wait_a_sec(); } }

18. Oops! First we configure! • Select Project – Components, Environment, Books

19. Configuration • Set the following parameters

20. Compiling the Project • Select Project – Build target

21. Check Status Window • There should be 0 errors and 0 warnings

22. Burn the program

23. Interrupt Subroutines 1. Interrupt subroutine for timer 1 Void timer1() interrupt 3 { Interrupt service code goes here } 2. Interrupt subroutine for timer 3 Void timer0() interrupt 1 { Interrupt service code goes here }

24. Interrupt Sources

25. BORING? Lets go with a more interesting one!

Atmel and pic microcontroller

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