參數(shù)資料
      型號: PIC16C554-04E/SO
      廠商: Microchip Technology
      文件頁數(shù): 34/108頁
      文件大?。?/td> 0K
      描述: IC MCU OTP 512X14 18SOIC
      標準包裝: 42
      系列: PIC® 16C
      核心處理器: PIC
      芯體尺寸: 8-位
      速度: 4MHz
      外圍設(shè)備: POR,WDT
      輸入/輸出數(shù): 13
      程序存儲器容量: 896B(512 x 14)
      程序存儲器類型: OTP
      RAM 容量: 80 x 8
      電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
      振蕩器型: 外部
      工作溫度: -40°C ~ 125°C
      封裝/外殼: 18-SOIC(0.295",7.50mm 寬)
      包裝: 管件
      2002 Microchip Technology Inc.
      Preliminary
      DS40143D-page 29
      PIC16C55X
      EXAMPLE 5-1:
      READ-MODIFY-WRITE
      INSTRUCTIONS ON AN
      I/O PORT
      5.4.2
      SUCCESSIVE OPERATIONS ON I/O
      PORTS
      The actual write to an I/O port happens at the end of an
      instruction cycle, whereas for reading, the data must be
      valid at the beginning of the instruction cycle, as shown
      in Figure 5-6. Therefore, care must be exercised if a
      write followed by a read operation is carried out on the
      same I/O port. The sequence of instructions should be
      such to allow the pin voltage to stabilize (load
      dependent) before the next instruction which causes
      that file to be read into the CPU is executed. Otherwise,
      the previous state of that pin may be read into the CPU
      rather than the new state. When in doubt, it is better to
      separate these instructions with an NOP or another
      instruction not accessing this I/O port.
      FIGURE 5-6:
      SUCCESSIVE I/O OPERATION
      ; Initial PORT settings: PORTB<7:4> Inputs
      ;
      PORTB<3:0> Outputs
      ; PORTB<7:6> have external pull-up and are
      ; not connected to other circuitry
      ;
      PORT latch PORT pins
      ;
      ---------- ---------
      ;
      BCF PORTB, 7
      ; 01pp pppp
      11pp pppp
      BCF PORTB, 6
      ; 10pp pppp
      11pp pppp
      BSF STATUS, RP0 ;
      BCF TRISB, 7
      ; 10pp pppp
      11pp pppp
      BCF TRISB, 6
      ; 10pp pppp
      10pp pppp
      Note
      1: This example shows write to PORTB followed by a read from PORTB.
      2: Data setup time = (0.25 T
      CY - TPD) where TCY = instruction cycle and TPD = propagation delay of Q1 cycle to
      output valid. Therefore, at higher clock frequencies, a write followed by a read may be problematic.
      Q1
      Q2
      Q3
      Q4
      Q1
      Q2
      Q3
      Q4
      Q1
      Q2
      Q3
      Q4
      Q1
      Q2
      Q3
      Q4
      RB <7:0>
      Port pin
      sampled here
      PC
      PC + 1
      PC + 2
      PC + 3
      NOP
      MOVF PORTB, W
      Read PORTB
      MOVWF PORTB
      Write to
      PORTB
      PC
      Instruction
      fetched
      T PD
      Execute
      MOVWF
      PORTB
      Execute
      MOVF
      PORTB, W
      Execute
      NOP
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