8051 Microcontroller ppt

It is all about 8051 microcontroller and its interfacing.

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2. CONTENTS Introduction. Microcontroller vs Microprocessor. Architecture. Pin diagram. Pin configuration. Memory Organisation . Timers. Interrupts. 11/21/2015 Rahul(13ec029) 2

3. Serial Communication. Interfacing. +5 volt power supply. switch interfacing. LED interfacing. 7-Segment display interfacing. LCD interfacing. ADC interfacing. keypad interfacing. relay interfacing. Applications. 11/21/2015 Rahul(13ec029) 3

4. INTRODUCTION A single chip computer or A CPU with all the peripherals like RAM, ROM, I/O, Timers, ADCs, etc on the same chip. OR A microcontroller is meant to be more self- - contained and independent, and functions as a tiny, dedicated computer. 11/21/2015 Rahul(13ec029) 4

5. FEATURES OF 8051 useful for small computing tasks. adequate for many control and monitoring application. packaging( RAM,ROM,Timers on-chip). Less power consumption. Easily upgradable. Cost per unit is less. Availability of tools of microcontroller such as proteus (simulator) and keil (compiler). 11/21/2015 Rahul(13ec029) 5

6. MICROPROCESSOR vs General purpose device. do not contain on-chip I/O ports, Timers, ADC Memory etc. used as CPU in computer. design is complex and expensive. it has zero status flag. MICROCONTROLLER single chip computer. it includes RAM ,ROM ,Timers, ADC, DAC, interrupts etc. performs control oriented applications. simple and less expensive it has no zero flag. 11/21/2015 Rahul(13ec029) 6

7. TYPES OF ARCHITECTURES Von-Neumann Architecture only one bus. used for both data transfer and instruction fetches. c annot be performed at same time. Harvard Architecture Separate data and instruction buses. Transfers to be performed simultaneously on both buses. 11/21/2015 Rahul(13ec029) 7

8. ARCHITECTURE 11/21/2015 Rahul(13ec029) 8

9. PIN DIAGRAM 11/21/2015 Rahul(13ec029) 9

10. PIN CONFIGURATION ALE/PROG-: when this pin is high it latches the low byte of the address during accesses to external memory. This pin is low during EPROM programming. PSEN-: Program Store Enable is the read strobe to external program memory . EA/VPP-: This pin is an active low pin connected to ground when microcontroller is accessing the program code stored in the external memory and connected to Vcc when it is accessing the program code in the on chip memory. 11/21/2015 Rahul(13ec029) 10

11. PIN CONFIGURATION RST -: applying a high pulse to this pin, the microcontroller will reset and terminate all activities . PORT 0 to 3 -: These are 8-bit bidirectional I/O port. Port 0 does not contain any internal pull-ups. Alternate function of port 3are RxD , TxD , INT0, INT1,T0,T1,WR,RD. XTAL1 & XTAL2 -: connected to oscillator amplifier. VCC-: Supply voltage. VSS-: Circuit ground potential. 11/21/2015 Rahul(13ec029) 11

12. MEMORY ORGANISATION Code Memory. External RAM. On-Chip Memory. Internal RAM. Special Function Register. Machine Cycle. 11/21/2015 Rahul(13ec029) 12

13. Code Memory holds the actual 8051 program. limited to 64K. may be both internal or external. External RAM slow accessing speed. it gains in quantity. limited to 64K . 11/21/2015 Rahul(13ec029) 13

14. On-Chip Memory It refers to that memory that physically exists on the microcontroller itself. Two types- Internal RAM. SFR( Special Function Register .) Total 256 bytes. Equal memory for RAM and SFR i,e 128bytes. 11/21/2015 Rahul(13ec029) 14

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16. SPECIAL FUNCTION REGISTER Accumulator. B Register. Program Status Word. Stack Pointer. Data Pointer. Ports 0 to 3. Timer Registers. Control Register. 11/21/2015 Rahul(13ec029) 16

17. +5 VOLT POWER SUPPLY 11/21/2015 Rahul(13ec029) 17

18. SWITCH INTERFACING 11/21/2015 Rahul(13ec029) 18

19. LED INTERFACING 11/21/2015 Rahul(13ec029) 19

20. 7 SEGMENT INTERFACING 11/21/2015 Rahul(13ec029) 20

21. LCD INTERFACING 11/21/2015 Rahul(13ec029) 21

22. RELAY INTERFACING 11/21/2015 Rahul(13ec029) 22

23. ADC INTERFACING 11/21/2015 Rahul(13ec029) 23

24. MATRIX KEYPAD INTERFACING 11/21/2015 Rahul(13ec029) 24

25. APPLICATION OF 8051 A utomobile. Rail Transport. Industrial Processing. Remote sensing. Robotics. Consumer electronics. Security(e-commerce and smart cards). Medical. Defense application. 11/21/2015 Rahul(13ec029) 25

26. THANK YOU 11/21/2015 Rahul(13ec029) 26