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MICROCONTROLLER ARCHITECTURE & ASSEMBLY LANGUAGE PROGRAMMING

MICROCONTROLLER ARCHITECTURE & ASSEMBLY LANGUAGE PROGRAMMING. Presented by S .HIMABINDU Department of ELETRONICS AND COMMUNICATIONS. Outline PIC18 Microcontroller families PIC18 architecture Data RAM file Register. INTRODUCTION.

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MICROCONTROLLER ARCHITECTURE & ASSEMBLY LANGUAGE PROGRAMMING

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  1. MICROCONTROLLER ARCHITECTURE & ASSEMBLY LANGUAGE PROGRAMMING Presented by S.HIMABINDU Department of ELETRONICS AND COMMUNICATIONS

  2. Outline • PIC18 Microcontroller families • PIC18 architecture • Data RAM file Register

  3. INTRODUCTION PIC is a family of modified Harvard architecture microcontrollers made by Microchip Technology, derived from the PIC1650 originally developed by General Instrument's Microelectronics Division.  The name PIC initially referred to "Peripheral Interface Controller”

  4. PICs are popular with both industrial developers and hobbyists alike due to their: • 1. low cost, • 2. wide availability, • 3.large user base, • 4.extensive collection of application notes, • 5.availability of low cost or free development tools, • 6.serial programming (and re-programming with flash memory) capability.

  5. PIC Families

  6. PIN DIAGRAMS

  7. PIN DIAGRAM

  8. PIC18 Architecture • PIC microcontrollers are based on advanced RISC architecture. • RISC stands for Reduced Instruction Set Computing. In this architecture, the instruction set of hardware gets reduced which increases the execution rate (speed) of system. •  • PIC microcontrollers follow Harvard architecture for internal data transfer

  9. RISC vs CISC • Reduced instruction set computing, or RISCis a CPU design strategy based on the insight that simplified instructions can provide higher performance if this simplicity enables much faster execution of each instruction. • A complex instruction set computer (CISC), is a computer where single instructions can execute several low-level operations

  10. ABOUT PIC18 • PIC microcontrollers are designed using the Harvard Architecture which includes: • Microprocessor unit (MPU) • Program memory for instructions • Data memory for data • I/O ports • Support devices such as timers

  11. Harvard Architecture vs Von Neumann Architecture • Von Neumann Architecture: • –Used single memory space for program and data. • –Limits operating bandwidth • •Harvard Architecture: • –Uses two separate memory spaces for program instructions and data • –Improved operating bandwidth • –Allows for different bus widths • Von Neumann Architecture8-bit BusCPUProgram & Data MemoryCPUHarvardArchitectureDataMemoryProgram Memory8-bit Bus16-bit Bus

  12. PIC18 Architecture

  13. PIC18 Features: CPU core The function of the CPU is to execute (process) information stored in memory. Program ROM The ROM use to store program

  14. EXAMPLE • Show the status of the C, DC and Z flag after the addition of 38H and 2FH. • Solution: • 38H 00111000 • + 2FH + 00101111 • 67H 01100111 • C = 0 • DC = 1 • Z = 0

  15. References • Microchip.com • Wikipedia, the free encyclopedia • http://www.engineersgarage.com

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