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  • The chapters in this introductory section are intended to answer the following questions:  What is an embedded system?  What is a time-triggered system and what are the alternatives?  Why are time-triggered systems generally considered to be more reliable than systems based on different architectures?  What is a software pattern?  How can patterns assist in the creation of reliable embedded applications

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  • 5 interrupt sources: 2 external, 2 timer, a serial port - 2 programmable interrupt priority levels - fixed interrupt polling sequence - can be enabled or disabled - IE (A8H), IP (B8H) for controlling interrupts

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  • Outlines: ¨Contrast and compare interrupts versus polling ¨Explain the purpose of the ISR ¨List the 6 interrupts of the 8051 ¨Explain the purpose of the interrupt vector table ¨Enable or disable 8051 interrupts ¨Program the 8051 timers using interrupts ¨Describe the two external hardware interrupts of the 8051

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  • Circumstances that we find ourselves in today in the field of microcontrollers had their beginnings in the development of technology of integrated circuits. This development has made it possible to store hundreds of thousands of transistors into one chip. That was a prerequisite for production of microprocessors , and the first computers were made by adding external peripherals such as memory, input-output lines, timers and other. Further increasing of the volume of the package resulted in creation of integrated circuits. These integrated circuits contained both processor and peripherals.

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  • Typical features of a modern 8051: • Thirty-two input / output lines. • Internal data (RAM) memory - 256 bytes. • Up to 64 kbytes of ROM memory (usually flash) • Three 16-bit timers / counters • Nine interrupts (two external) with two priority levels. • Low-power Idle and Power-down modes. The different members of this family are suitable for everything from automotive and aerospace systems to TV “remotes”. COPYRIGHT © MICHAEL J. PONT, 2001-2006. Contains material from: Pont, M.J. (2002) “Embedded C”, Addison-Wesley. VSS P2.0 XTL1 P2.1 XTL2 P2.2 P3.7 P2.

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  • There are many contents in this book: Features Pin Configurations, Overview About, Code Examples, AVR CPU Core, AVR ATmega32 Memories, System Clock and Clock Options, Power Management and Sleep Modes, System Control and Reset, Interrupts, I/O Ports, External Interrupts, 8-bit Timer/Counter0 with PWM, Timer/Counter0 and Timer/Counter1 Prescalers, 16-bit Timer/Counter1, 8-bit Timer/Counter2 with PWM and Asynchronous Operation, Two-wire Serial Interface, Analog to Digital Converter.

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