Uploaded byDiwaker Pant
Interfacing methods of microcontroller
The document discusses microcontroller interfacing. It defines interfacing as the transfer of data between microcontrollers and peripherals using buses. Interfacing is needed to connect a microcontroller's computation capabilities to external signals or devices to enable man-machine interaction. Various interfacing methods are described, including wiring techniques like wires, buses, and pins. Examples of interfacing a microcontroller to memory and I/O devices are provided. Common microcontroller interfaces like digital input/output, analog, serial interfaces are also summarized along with their applications and advantages/disadvantages.
Interfacing methods of microcontroller
- 1. Presented By :- DiwakerPant ME (REGULAR- 2011) NITTTR CHD
- 2. What is Interfacing. Need of interfacing. Micro-controller Interfacing – Basics. Interfacing Methods. Microcontroller Interfaces Examples. October 9, 2012 Presented by :- Diwaker Pant 2
- 3. Transfer of data between microcontrollers and peripherals (memory, I/O devices etc.) implemented using buses called inte rfacing . Connecting the computation capabilities of a microcontroller to external signals or to external world. Creating man-machine interaction. October 9, 2012 Presented by :- Diwaker Pant 3
- 4. The basic needis to have some input/output peripherals and man-machine interface. Interactions with a computer or TV are possible using the mouse /keyboard/display screen. The no. of real world devices and systems like mobile phone and washing m/c need the keypad and display to enable human-computer interactions. October 9, 2012 Presented by :- Diwaker Pant 4
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- 6. Address bus for example (A15-A0). Data bus for example (D7-D0). Control lines : For example in 8051 microcontroller. EA (External Access). ALE (Address Latch Enable). PSEN (Program Store Enable). RD, WR October 9, 2012 Presented by :- Diwaker Pant 6
- 7. Wires: RD/WR ◦ Unidirectional Data Bus ◦ Bi-directional Bus Microcontroller Memory ◦ Set of wires with a Enable (ROM) single function. Address bus, Data bus Address Bus October 9, 2012 Presented by :- Diwaker Pant 7
- 8. P0 P1 LATCH ALE Enable Microcontroller (8051) PSEN OE P3 ROM P2 Connects bus to microcontroller or memory Often referred to as a pin ◦ Actual pins on periphery of IC package that plug into socket on printed-circuit board ◦ Today, metal “ pads” connecting processors and memories within single IC October 9, 2012 Presented by :- Diwaker Pant 8
- 9. Micro-controllers are useful to the extent that they communicate with other devices, such as sensors , motors, switches, keypads , displays memory and even other micro-controllers. To solve the complex problem of balancing circuit design criteria such as • Features , Cost , Size , Weight • Power consumption , Reliability , Manufacturability October 9, 2012 Presented by :- Diwaker Pant 9
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- 11. Advantages Disadvantages Simplest interface. Only on/off control/monitoring Lowest-cost to implement. Short distance, few feet High speed maximum. Low programming Single device overhead control/monitoring October 9, 2012 Presented by :- Diwaker Pant 11
- 12. Digital Input Digital output Reading the status of Relay control buttons or switches LED Display Keypad Interface LCD Sensor Interface DAC October 9, 2012 Presented by :- Diwaker Pant 12
- 13. Advantages Disadvantages Simple interface Not all microcontrollers have analog I/O. High speed Complicates the circuit design when external Low programming ADC /DAC are needed. overhead Short distance, few feet maximum. October 9, 2012 Presented by :- Diwaker Pant 13
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- 15. Presented by :-Diwaker Pant October 9, 2012 15
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- 17. Presented by :-Diwaker Pant October 9, 2012 17
- 18. PIC I/O Port October 9, 2012 Presented by :- Diwaker Pant 18
- 19. P No. F in unction Description 1 Vss Connected to Ground 2 Vcc +5v supply 3 VEE Contrast control Power supply 4 RS 0=Select Command Register 1=Select Data Register 5 R/W 1=Read , 0=Write 6 EN Enable 7-14 DB0-DB7 8-bit data bus Presented by :- Diwaker Pant October 9, 2012 19
- 20. PIC 16F8XX October 9, 2012 Presented by :- Diwaker Pant 20
- 21. Serial Bus system is divided in two categories. 1. I2C (Inter Integrated Circuit Bus). 2. SPI (Serial Peripheral Interface Bus). I2C is 2 wire, one master multiple slaves system. SPI is 4 wire , one master multiple slaves system. Presented by :- Diwaker Pant October 9, 2012 21
- 22. In thissystem two signal (wire) are there namely SDA= Serial Data wire. SCL= Serial Clock wire. To start the communications, the bus master (typically a microcontroller) places the address of the device with which it intends to communicate (the slave) on the bus. All slave devices monitor the bus to determine if the master device is sending their address. Only the device with the correct address communicates with the master. Presented by :- Diwaker Pant October 9, 2012 22
- 23. SDA SCL PIC Presented by :- Diwaker Pant October 9, 2012 23
- 24. In thissystem 4 signal wires are used. 1.CS= Chip Select 2.DIN= Data In 3.DOUT= Data Out 4.CLK= Clock Signal Presented by :- Diwaker Pant October 9, 2012 24
- 25. SPI bus is a master/slave interface. Whenever two devices communicate, one is referred to as the "master" and the other as the "slave" device. The master drives the serial clock. SPI is full duplex: Data is simultaneously transmitted and received. Presented by :- Diwaker Pant October 9, 2012 25
- 26. CS DIN MULTIMEDIA PIC-16F8XX CARD DOUT MMC CLK Presented by :- Diwaker Pant October 9, 2012 26
- 27. Presented by :-Diwaker Pant October 9, 2012 27
- 28. We can say that by the help of suitable interfacing methods we can create Man-Machine interaction. Nowadays all automatic systems uses embedded system and by the help of interfacing we can enjoy the technology and can make the technology more user friendly. October 9, 2012 Presented by :- Diwaker Pant 28
- 29. Microcontrollers(Theory and applications)-Ajay V. Deshmukh( Page no.215- 232). Microcontroller interfacing techniques by BiPOM Electronics, INC (www.bipom.com) Presented by :- Diwaker Pant October 9, 2012 29
- 30. ? Query October 9, 2012 Presented by :- Diwaker Pant 30
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