Interrupt priorities

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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

    ppt17p leyleyley 16-12-2009 143 60   Download

  • Until fairly recently most scientific data-gathering systems and industrial control procedures were based on electromechanical devices such as chart recorders and analogue gauges. The capability to process and analyse data was rather limited (and in some cases error prone) unless one had access to a minicomputer or mainframe. Today, that situation has changed considerably. I am sure that most potential readers of this book will be aware of the profound effect the PC has had on the way in which engineers and scientists are able to approach data-gathering tasks....

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  • Tập thanh ghi Các thanh ghi chính – A, B, R0 to R7 : 8 bit registers – DPTR : [DPH:DPL] 16 bit register – PC : Program Counter (Instruction Ptr) 16bits – 4 sets of R0-R7 – Stack pointer SP – PSW Program Status Word (Flags) Carry CY, Aux Carry AC, Reg Bank selector, Overflow, Parity – Special Function Registers (SFRs) Timers, Interrupt (enable, priority), Serial port, power Electrical Engineering 2 1 .

    pdf22p hung_ee 31-05-2012 174 58   Download

  • On to networked resources should not have processing interrupted to service unmanaged traffic or be subject to a computational resource’s resident operating system switching contexts to a lower priority task. For data that originate from sensors at very high streaming rates, a storage solution, as discussed in Section 2.3.2, is needed that is capable of recording sensor data in real time as well as robust in the face of network resource failures; this insures that a high-priority application can continue processing in the presence of malfunctioning or compromised networked equipment....

    pdf10p thachsaudoi 22-12-2009 74 16   Download

  • 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.

    pdf24p vanlektmt 27-01-2011 45 6   Download

  • 8-bit CPU optimized for control applications Extensive Boolean processing (single-bit logic) capabilities 64K Program Memory address space 64K Data Memory address space Up to 4K bytes of on-chip Program Memory 128 bytes of on-chip Data RAM 32 bi-directional and individually addressable I/O lines Two 16-bit timer/counters 6-source/5-vector interrupt structure with two priority levels

    ppt55p lqvang02 02-02-2013 29 4   Download


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