The document discusses the 8051 microcontroller, including its features, applications, and programming. It provides an overview of the 8051 architecture, describing its registers, memory mapping, I/O ports, timers, and interrupts. It also discusses how the 8051 is commonly used in applications like home appliances, industrial equipment, and toys.

1. MICROCONTROLLER-8051 Features & Applications Dr. Y .Narasimha Murthy Ph.D., Sri Saibaba National College (Autonomous) ANANTAPUR-515001(A.P)

14. Types of Microcontrollers

17. Microcontroller Architectures CPU Program + Data Address Bus Data Bus Memory Von Neumann Architecture CPU Program Address Bus Data Bus Harvard Architecture Memory Data Address Bus Fetch Bus 0 0 0 2 n

19. “Original” 8051 Microcontroller Oscillator and timing 4096 Bytes Program Memory (ROM) 128 Bytes Data Memory (RAM) Two 16 Bit Timer/Event Counters 8051 CPU 64 K Byte Bus Expansion Control Programmable I/O Programmable Serial Port Full Duplex UART Synchronous Shifter Internal data bus External interrupts subsystem interrupts Control Parallel ports Address Data Bus I/O pins Serial Input Serial Output

21. 8051 CPU Registers A ( 8-bit Accumulator ) B ( 8-bit register for Mul &Div ) PSW ( 8-bit Program Status Word ) SP (8-bit Stack Pointer ) PC (16-bit Program Counter ) DPTR (16-bit Data Pointer )

23. List of Registers (*Denotes the SFRs)

24. Contd…

25. PSW REGISTER

26. Memory mapping in 8051 ROM memory map in 8051 family 4k DS5000-32 8k 32k from Atmel Corporation from Dallas Semiconductor 0000H 0FFFH 0000H 1FFFH 0000H 7FFFH 8051 8752

27. RAM memory space allocation in the 8051 7FH 30H 2FH 20H 1FH 17H 10H 0FH 07H 08H 18H 00H Register Bank 0 (Stack) Register Bank 1 Register Bank 2 Register Bank 3 Bit-Addressable RAM Scratch pad RAM

29. Port 0 with Pull-Up Resistors

32. Alternate functions of P3

34. I/O Port contd…

42. TMod contd…

49. Equivalent Instructions for the Timer Control Register TCON: Timer/Counter Control Register CLR TCON.7 = CLR TF1 SETB TCON.7 = SETB TF1 CLR TCON.6 = CLR TR1 SETB TCON.6 = SETB TR1 For timer 1 CLR TCON.5 = CLR TF0 SETB TCON.5 = SETB TF0 CLR TCON.4 = CLR TR0 SETB TCON.4 = SETB TR0 For timer 0 TF1 IT0 IE0 IT1 IE1 TR0 TF0 TR1

51. Square-wave of 66%duty cycle. HERE : SETB P1.0 ( Make bit of Port 0 High) LCALL DELAY LCALL DELAY CLR P1.0 LCALL DELAY SJMP HERE : Keep doing it

53. 8051- SERIAL COMMUNICATION

54. Basics of serial communication

55. Types of Serial communications

57. Interfacing to PC

58. SCON (Serial control) register

73. Applications of Microcontrollers

74. Simple Interfacing Examples

75. Seven segment Interfacing

76. Traffic light controller

78. Closed loop control system-Temperature control example

87. Recent Wonders

88. Recent Wonders contd ........

89. Recent Wonders contd ........

92. Useful websites