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1. Study of 8051 – A Single Chip Micro Computer

2. A Micro controller is a ‘ complete computer ’ on a single chip… CPU / Microprocessor Memory / Hard Disk/RAM I/O Ports / I/O Devices

3. Micro controller Vs Micro processor 8051 ROM/27C512 RAM/6264 I/O Ports/8255 8085

6. Overview of 8051 family 6 8 6 Interrupts 1 1 1 Serial Port 2 3 2 Timers 32 32 32 I/O pins 128 bytes 256 bytes 128 bytes RAM 0K 8K 4K ROM 8031 8052 8051 Feature

8. Architecture of 8051 CPU On-chip RAM (128 bytes) On-chip ROM for program code(4K) 4 I/O Ports Timer 0 Serial Port OSC External interrupts Timer 1 Timer/Counter Bus Control TxD RxD P0 P1 P2 P3 Address/Data Counter Inputs Interrupt Control

9. Pin Diagram of 8051 Port 1 Port 3 Port 2 Port 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST (RXD)P3.0 (TXD)P3.1 (T0)P3.4 (T1)P3.5 XTAL2 XTAL1 GND (INT0)P3.2 (INT1)P3.3 (RD)P3.7 (WR)P3.6 Vcc P0.0(AD0) P0.1(AD1) P0.2(AD2) P0.3(AD3) P0.4(AD4) P0.5(AD5) P0.6(AD6) P0.7(AD7) EA/VPP ALE/PROG PSEN P2.7(A15) P2.6(A14) P2.5(A13) P2.4(A12) P2.3(A11) P2.2(A10) P2.1(A9) P2.0(A8) 8051 (8031)

12. Connecting Power Supply and Crystal AT89C51

13. Connecting RESET circuit

14. Writing application Software A LED Blinking program ORG 0H START: SETB P3.7 SETB P3.6 ACALL DELAY CLR P3.7 CLR P3.6 ACALL DELAY JMP START DELAY: MOV R5, #11 H3: MOV R4, #248 H2: MOV R3, #255 H1: DJNZ R3, H1 DJNZ R4, H2 DJNZ R5, H3 RET END