Unit 01.Lec2 Introduction to 8051 microcontroller (2).pptx
- 1. Unit 1: Session-2/36 Intel 8051 Functional block diagram Session Plan
- 2. Outline: A. Attendance B. Review of the previous session C. Learning Outcomes of the session D. Content E. Student’s evaluation F. Preparation for next session G. Wrap up
- 3. B. Review of previous session: • Basics features of 8051 • Registers of 8051 • Block Diagram with the function of each block • Few Data Transfer Instructions and related programs
- 4. C. Learning Outcomes of the session: • To make pin diagram of 8051 microcontroller • To identify which pins are output or input pins based in their working • To write a program to transfer the data in keil software
- 5. D. Content: Content Learning / Methodology Faculty Approach Typical Student Activity Skill/ Competency Developed Pin Diagram of 8051 microcontroller PPT Explain Understand,Remem ber Critical Thinking - Observation Functions of each pin Chalk Board, PPT Explain Understand,Remem ber Critical Thinking – Observation Identification of input/output pins Chalk Board, PPT Discuss Discussion Critical Thinking – Observation Assembly Language Program Chalk Board, keil software Guide programming Critical Thinking – Coding Skill
- 6. 4*8= 32 2 pins Vcc and supply = 32+2=34, 1 pin for reset = 34+1 =35 2 pins for XTAL , 35+2=37 ALE =1, address bus enable ALE =0, Data bus enable External ROM 0 voltage
- 7. Pins description • Pins 1 to 8 − These pins are known as Port 1. This port doesn’t serve any other functions. It is internally pulled up, bi-directional I/O port. • Pin 9 − It is a RESET pin, which is used to reset the microcontroller to its initial values. • Pins 10 to 17 − These pins are known as Port 3. This port serves some functions like interrupts, timer input, control signals, serial communication signals RxD and TxD, etc. • Two pins in Port3 are used for the RD (read) and WR (write) signals to communicate with the external data memory. The T0and T1 pins are used for counter inputs. The RXD and TXD pins are used for the UART for serial communication. The INT0 and INT1 pins are used for two interrupt input pins. So when the external memory is used, there is only one port (Port1) for I/O operations which does not have any other function.
- 8. • Pins 18 & 19 − These pins are used for interfacing an external crystal to get the system clock. • Pin 20 − This pin provides the power supply to the circuit. • Pins 21 to 28 − These pins are known as Port 2. It serves as I/O port. Higher order address bus and data bus are also multiplexed using this port. • Pin 29 − This is PSEN pin which stands for Program Store Enable. It is an output signal and used to enable external program memory , so that it can read the data from the external program memory. • Pin 30 − This is EA pin which stands for External Access input. It is used to enable/disable the external memory interfacing. If EA = 0 , microcontroller access external memory and If EA = 1 , microcontroller access internal memory.
- 9. • Pin 31 − This is ALE pin which stands for Address Latch Enable. It is used to demultiplex the address-data signal of port 0. When it is high, it indicates that the Port 0 holds the lower order address bits. And when ALE is low, it indicates Port 0 is holding the data bits. • Pins 32 to 39 − These pins are known as Port 0. It serves as I/O port. Lower order address and data bus signals are multiplexed using this port. • Pin 40 − This pin is used to provide power supply to the circuit. • 8051 microcontrollers have 4 I/O ports each of 8-bit, which can be configured as input or output. Hence, out of 40 pins, total 32 input/output pins allow the microcontroller to be connected with the peripheral devices. • The pins can be configured as 1 for input and 0 for output as per the logic state.
- 10. 8051 Data Transfer Instructions • MOV Instruction: It copies data from one location to another. MOV destination, source. e.g. : MOV A, Ro ( copies the contents of register Ro to register A ) MOV A, B MOV A, # 55 H, ( A= 55 H ) MOV Ro, A ( Ro = ? ) MOV R2, A ( R2= ?) MOV R5, # 0F9 H ( R5 = ?) MOV 55 H , # 12H ( 12 h data will be saved at the address 55 h) MOV R0, # 55 H ( R0 = 55 H) MOV A, @R0 (@ indicates that an address is saved inside R0)(it will consider 55 H as an address, it will go to 55 h address and transfer data at that address i.e.12h in the A) MOV A, 55 H (A =12 h)
- 11. E. Student’s evaluation Q1. How many pins are there in 8051 microcontroller? Q2. State the number of input pins and output pins. Q3. How many ports are there in 8051? Q4. How many pins are multifunctional pins? Q5. Which pins are used for serial communication? Q6. What are buses, how many types of buses are there?
- 12. • Functions of all the pins of 8051 • Atithmatic instructions and programs based on it F. Preparation for Next Session:-
- 13. G. Wrap Up In this lecture we have learned ∙ Pin Diagram of 8051 ∙ Function of different pins of 8051 ∙ Data Transfer instructions and their programming