Main - Compiled By : Richa Arora Akshat Rohtagi ECE HMRITM

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Compiled By : Richa Arora Akshat Rohtagi ECE HMRITM www.powerpointpresentationon.blogspot.com
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The embedded system is a combination of computer hardware, software additional electrical & mechanical parts A computer is used in such devices primarily as a means to simplify the system design and to provide flexibility. Embedded systems employ the use of a RTOS (Real-Time Operating System).
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              Block Diagram of Embedded System Block Diagram of Embedded System
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Microcontroller RAM ROM I/O Port Timer Serial COM Port CPU A smaller computer. On-chip RAM, ROM, I/O ports. .. Example:- Motorola’s 6811, Intel’s 8051 and PIC 16X A single chip                     Microcontroller  Microcontroller 
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              The 8051 Microcontroller The 8051 Microcontroller   :   : The 8051 is the first microcontroller of the MCS-51 family introduced by Intel Corporation at the end of the 1970’s. The 8051 family characteristics: ○ The 8051 family characteristics: ○ 4K Bytes ROM ○ 128 Bytes RAM ○ two timer/counters (16 bit) ○ A serial port ○ 32 input/output port ○ Interrupt controller
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8051 Internal Architecture 8051 Internal Architecture
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IC 8051 Pin Description IC 8051 Pin Description Ground Voltage Supply (+5V)
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IC 8051 Pin Description IC 8051 Pin Description Port 0 from Pin-39 to Pin-32 An 8-bit open drain bidirectional port. DUAL FUNCTION Used to access both data and address
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IC 8051 Pin Description IC 8051 Pin Description Port 1 from Pin-1 to pin-8 8-bit bidirectional I/O port with internal pull-ups
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IC 8051 Pin Description IC 8051 Pin Description Port 2 from Pin-21 to pin-28 Used to access address and I/O
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IC 8051 Pin Description IC 8051 Pin Description Port 3 from Pin-10 to Pin-17 P3.0 : RxD(serial input port) P3.1 :TxD (serial output port) P3.2 : INT0 (external interrupt 0) P3.3 : INT1 (external interrupt 1) P3.4 :T0 (timer 0 external input) P3.5 :T1 (timer 1 external input) P3.6 :WR (external data memory write strobe) P3.7 :RD (external data memory read strobe)
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crystal reset External memory Add. Latch enable Program Store Enable IC 8051 Pin Description IC 8051 Pin Description
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IC 8051 Daily Applications IC 8051 Daily Applications Moving message display Digital clock Traffic Light 7 segment display
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Immediate addressing modes ADD A, #23h (Add immediate data to Acc) Register addressing modes ADD A, R2 (Add register to Accumulator) Direct addressing modes ADD A, 40h (Add data at location 40h to Accumulator) Register Indirect addressing modes ADD A,@R2 (Add indirect RAM to Acc) IC 8051 Addressing Modes IC 8051 Addressing Modes
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Interrupts in 8051 Interrupts in 8051 An interrupt is an external or internal event that interrupts the microcontroller to inform it that a device needs its service The advantage of interrupts is that the microcontroller can serve many devices (not all at the same time) time Interrupt service Interrupt service Program Program
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Main - Compiled By : Richa Arora Akshat Rohtagi ECE HMRITM

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