參數(shù)資料
      型號(hào): SDA 5255
      廠商: SIEMENS AG
      英文描述: TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器(含ROM 型 ))
      中文描述: TVTEXT 8位微控制器(ROM的版本)(電視視頻的8位微控制器(含光盤型))
      文件頁數(shù): 71/143頁
      文件大小: 1050K
      代理商: SDA 5255
      SDA 525x
      Semiconductor Group
      71
      1998-04-08
      If two requests of different priority levels are received simultaneously, the request of
      higher priority level will be serviced. If requests of the same priority level are received
      simultaneously, an internal polling sequence determines which request is serviced. Thus
      within each priority level there is a second priority structure determined by the polling
      sequence, see in
      Table 18
      .
      Note that the “priority within level” structure is only used to resolve simultaneous
      requests of the same priority level.
      6.3.4.1
      The process whereby a higher-level interrupt request interrupts a lower-level interrupt
      service program is called nesting. In this case the address of the next instruction in the
      lower-priority service program is pushed onto the stack, the stack pointer is incremented
      by two and processor control is transferred to the program memory location of the first
      instruction of the higher-level service program. The last instruction of the higher-priority
      interrupt service program must be a RETI-instruction. This instruction clears the higher
      “priority-level-active” flip-flop. RETI also returns processor control to the next instruction
      of the lower-level interrupt service program. Since the lower “priority-level-active” flip-
      flop has remained set, higher priority interrupts are re-enabled while further lower-priority
      interrupts remain disabled.
      Interrupt Nesting
      Table 18
      Source
      1.
      2.
      3.
      4.
      5.
      6.
      Priority within Level
      (highest)
      IE0
      TF0
      IE1
      TF1
      RI/TI
      DVIRST
      DHIRST
      EVENST
      LIN24ST
      AVIRST
      AHIRST
      IADC
      7.
      (lowest)
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