Xem 1-9 trên 9 kết quả Hardware interrupts
  • 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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  • During the early years of microprocessors, there were few engineers with education and experience in the applications of microprocessor technology. Now that microprocessors and microcontrollers have become pervasive in so many devices, the ability to use them has become almost a requirement for many technical people.

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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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  • Die einfachsten technischen Systeme nutzen eine Hauptschleife (Run-Loop), sind also recht einfach und schnell zum Laufen gebracht. Vorausgesetzt, wir können mit JTAG-Adapter, Emulator und Bootloader umgehen. Eine kurze Einführung in diese Themen ist im Kap. 2 gegeben. Die nächste Stufe der Expertise wird erreicht, wenn wir es mit technischen Systemen zu tun haben, auf denen ein Betriebssystem läuft oder eigentlich laufen sollte. Zwei wichtige Betriebssysteme in der embeddedWelt sind Linux und QNX.

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  • Microcontroller Instruction Set For interrupt response time information, refer to the hardware description chapter.

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  • Title Pages License/Copyright Table of Contents About the Author/Colophon Preface Chapter 1: An Introduction to Device Drivers Chapter 2: Building and Running Modules Chapter 3: Char Drivers Chapter 4: Debugging Techniques Chapter 5: Concurrency and Race Conditions Chapter 6: Advanced Char Driver Operations Chapter 7: Time, Delays, and Deferred Work Chapter 8: Allocating Memory Chapter 9: Communicating with Hardware Chapter 10: Interrupt Handling

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  • For interrupt response time information, refer to the hardware description chapter. Note: 1. Operations on SFR byte address 208 or bit addresses 209-215 (that is, the PSW or bits in the PSW) also affect flag settings. Instructions that Affect Flag Settings(1) The Instruction Set and Addressing Modes Rn Register R7-R0 of the currently selected Register Bank. direct 8-bit internal data location’s address. This could be an Internal Data RAM location (0-127) or a SFR [i.e., I/O port, control register, status register, etc. (128-255)].

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  • Chapter 2 discusses the general structure of computer systems. It may be a good idea to review the basic concepts of machine organization and assembly language programming. The students should be comfortable with the concepts of memory, CPU, registers, I/O, interrupts, instructions, and the instruction execution cycle. Since the operating system is the interface between the hardware and user programs, a good understanding of operating systems requires an understanding of both hardware and programs.

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  • Module 2 - Computer-system structures. Chapter 2 discusses the general structure of computer systems. It may be a good idea to review the basic concepts of machine organization and assembly language programming. The students should be comfortable with the concepts of memory, CPU, registers, I/O, interrupts, instructions, and the instruction execution cycle. Since the operating system is the interface between the hardware and user programs, a good understanding of operating systems requires an understanding of both hardware and programs.

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