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    1. 參數(shù)資料
      型號(hào): SC80C451CCA68
      廠商: NXP SEMICONDUCTORS
      元件分類: 微控制器/微處理器
      英文描述: Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 15 psi, Gage, 1/8-27 NPT, 10 Vdc excitation
      中文描述: 8-BIT, 12 MHz, MICROCONTROLLER, PQCC68
      封裝: PEDESTAL, PLASTIC, MO-047AE, SOT-188-3, LCC-68
      文件頁(yè)數(shù): 13/22頁(yè)
      文件大?。?/td> 162K
      代理商: SC80C451CCA68
      Philips Semiconductors
      Product specification
      80C451/83C451/87C451
      80C51 8-bit microcontroller family
      4K/128 OTP/ROM/ROMless, expanded I/O
      1998 May 01
      13
      EXPLANATION OF THE AC SYMBOLS
      Each timing symbol has five characters. The first character is always
      ‘t’ (= time). The other characters, depending on their positions,
      indicate the name of a signal or the logical status of that signal. The
      designations are:
      A – Address
      C – Clock
      D – Input data
      H – Logic level high
      I
      – Instruction (program memory contents)
      L – Logic level low, or ALE
      P – PSEN
      Q – Output data
      R – RD signal
      t
      – Time
      V – Valid
      W – WR signal
      X – No longer a valid logic level
      Z – Float
      Examples:
      t
      AVLL
      = Time for address valid to ALE low.
      t
      LLPL
      = Time for ALE low to PSEN low.
      t
      PXIZ
      ALE
      PSEN
      PORT 0
      PORT 2
      A0–A15
      A8–A15
      A0–A7
      A0–A7
      t
      AVLL
      t
      PXIX
      t
      LLAX
      INSTR IN
      t
      LHLL
      t
      PLPH
      t
      LLIV
      t
      PLAZ
      t
      LLPL
      t
      AVIV
      SU00006
      t
      PLIV
      Figure 2. External Program Memory Read Cycle
      t
      LLAX
      ALE
      PSEN
      PORT 0
      PORT 2
      RD
      A0–A7
      FROM RI OR DPL
      DATA IN
      A0–A7 FROM PCL
      INSTR IN
      P2.0–P2.7 OR A8–A15 FROM DPH
      A0–A15 FROM PCH
      t
      WHLH
      t
      LLDV
      t
      LLWL
      t
      RLRH
      t
      RLAZ
      t
      AVLL
      t
      RHDX
      t
      RHDZ
      t
      AVWL
      t
      AVDV
      t
      RLDV
      SU00007
      Figure 3. External Data Memory Read Cycle
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