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    1. 參數(shù)資料
      型號: 38D5
      廠商: Renesas Technology Corp.
      英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
      中文描述: 單芯片8位CMOS微機
      文件頁數(shù): 34/141頁
      文件大?。?/td> 2027K
      代理商: 38D5
      Rev.3.01
      REJ03B0158-0301
      Aug 08, 2007
      Page 34 of 134
      38D5 Group
      TIMERS
      8-Bit Timer
      The 38D5 Group has four built-in 8-bit timers: Timer 1, Timer 2,
      Timer 3, and Timer 4.
      Each timer has the 8-bit timer latch. All timers are down-
      counters.
      When the timer reaches “00
      16
      ”, the contents of the timer latch is
      reloaded into the timer with the next count pulse. In this mode,
      the interrupt request bit corresponding to that timer is set to “1”.
      The count can be stopped by setting the stop bit of each timer to
      “1”.
      Fig. 25 Timer 1-4 block diagram
      Timer 1 latch (8)
      Timer 1 (8)
      Timer 2 latch (8)
      Timer 2 (8)
      Timer 3 latch (8)
      Timer 3 (8)
      Timer 4 latch (8)
      Timer 4 (8)
      Timer 1 interrupt request
      Timer 2 interrupt request
      Timer 3 interrupt request
      Timer 4 interrupt request
      X
      CIN
      Data bus
      Timer 1 count stop bit
      10 bit
      PWM1
      circuit
      1/2
      Q
      Q
      S
      T
      Timer 4 operating
      T
      4OUT
      output
      edge switch bit
      4
      P7
      Timer 4 output selection bit
      P7
      4
      direction
      register
      P7
      4
      /PWM
      1
      /
      T
      4OUT
      10 bit
      PWM0
      circuit
      1/2
      Q
      Q
      S
      T
      Timer 3 operating
      T
      3OUT
      output
      edge switch bit
      P7
      3
      latch
      Timer 3 output selection bit
      Timer 3 output selection bit
      P7
      3
      direction
      register
      P7
      3
      /PWM
      0
      /
      T
      3OUT
      “00”
      “01”
      “10”
      “00”
      “01”
      “1”
      “0”
      “01”
      “10”
      “00”
      “0”
      “1”
      “1”
      “0”
      “0”
      “1”
      “1”
      “0”
      Clock for
      Timer 1
      Clock for
      Timer 2
      Clock for
      Timer 3
      Clock for
      Timer 4
      Timer 1
      Timer 2
      Timer 3
      Timer 4
      Frequency division
      selection bits
      (2 bits for each Timer)
      C
      8
      The following values can be selected
      the clock for Timer;
      1/1, 1/2, 1/16, 1/256
      Frequency divider
      1/2
      Q
      Q
      S
      T
      T
      2OUT
      output
      edge switch bit
      Timer 2 output selection bit
      “0”
      “1”
      “10”
      Timer Y
      output
      Timer 3 write control bit
      PWM01 register (2)
      PWM01 register (2)
      Timer 4 write control bit
      Timer 2 write control bit
      Timer 1 count
      source selection
      bits
      Timer 2 count
      source selection
      Timer 2 count stop bit
      Timer 3 count source
      selection bit
      Timer 3 count stop bit
      Timer 4 count source
      selection bits
      Timer 4 count stop bit
      Timer 4 output selection bit
      φ
      SOURCE
      “11”
      f(X
      IN
      )
      (1)
      C
      C
      C
      φ
      Note1:
      φ
      SOURCE indicates the followings:
      X
      IN
      input in the frequency/2, 4, or 8 mode
      On-chip oscillator divided by 4 in the on-chip oscillator mode
      Sub-clock in the low-speed mode
      P7
      2
      direction
      register
      P7
      2
      /T
      2OUT
      /CKOUT
      P7
      2
      latch
      Timer 2 output selection bit
      00
      01
      10
      P7
      2
      clock output control bit
      System
      clock
      φ
      X
      CIN
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