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    1. 參數(shù)資料
      型號(hào): PSD954215JIT
      廠商: 意法半導(dǎo)體
      英文描述: Flash In-System Programmable ISP Peripherals For 8-bit MCUs
      中文描述: Flash在系統(tǒng)可編程ISP的外設(shè)的8位微控制器
      文件頁(yè)數(shù): 57/110頁(yè)
      文件大小: 1737K
      代理商: PSD954215JIT
      57/110
      PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2
      Table 26. Drive Register Pin Assignment
      Note: 1. NA = Not Applicable.
      Port Data Registers
      The Port Data Registers, shown in Table
      27
      , are
      used by the MCU to write data to or read data from
      the ports. Table
      27
      shows the register name, the
      ports having each register type, and MCU access
      for each register type. The registers are described
      below.
      Data In
      Port pins are connected directly to the Data In buff-
      er. In MCU I/O input mode, the pin input is read
      through the Data In buffer.
      Data Out Register
      Stores output data written by the MCU in the MCU
      I/O output mode. The contents of the Register are
      driven out to the pins if the Direction Register or
      the output enable product term is set to ’1.’ The
      contents of the register can also be read back by
      the MCU.
      Output Macrocells (OMC).
      The CPLD Output
      Macrocells (OMC) occupy a location in the MCU’s
      address space. The MCU can read the output of
      the Output Macrocells (OMC). If the OMC Mask
      Register bits are not set, writing to the macrocell
      loads data to the macrocell flip-flops. See the sec-
      tion entitled
      PLDS, page 33
      .
      OMC Mask Register
      Each OMC Mask Register bit corresponds to an
      Output Macrocell (OMC) flip-flop. When the OMC
      Mask Register bit is set to a 1, loading data into the
      Output Macrocell (OMC) flip-flop is blocked. The
      default value is 0 or unblocked.
      Table 27. Port Data Registers
      Drive
      Register
      Bit 7
      Bit 6
      Bit 5
      Bit 4
      Bit 3
      Bit 2
      Bit 1
      Bit 0
      Port A
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Slew
      Rate
      Slew
      Rate
      Slew
      Rate
      Slew
      Rate
      Port B
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Slew
      Rate
      Slew
      Rate
      Slew
      Rate
      Slew
      Rate
      Port C
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Open
      Drain
      Port D
      NA
      1
      NA
      1
      NA
      1
      NA
      1
      NA
      1
      Slew
      Rate
      Slew
      Rate
      Slew
      Rate
      Register Name
      Port
      MCU Access
      Data In
      A,B,C,D
      READ – input on pin
      Data Out
      A,B,C,D
      WRITE/READ
      Output Macrocell
      A,B,C
      READ – outputs of macrocells
      WRITE – loading macrocells flip-flop
      Mask Macrocell
      A,B,C
      WRITE/READ – prevents loading into a given
      macrocell
      Input Macrocell
      A,B,C
      READ – outputs of the Input Macrocells
      Enable Out
      A,B,C
      READ – the output enable control of the port driver
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