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7-3 中斷應用實例

      利用 Timer0 之計時模式 1 設計一時鐘,其電路圖如下:

                                  電路圖

      20P      19

    20P        12MHz X1

      8.2K           18  X2
               Vcc
Vcc                      EA
                     31       VP
        330 
        330   9 RESET
        330 
        330                                                       Vcc
        330 
        330   39 P0.0                             21       330 
        330   38 P0.1                 P2.0                 330 
        330   37 P0.2                                      330 
               36 P0.3                             22       330 
               35 P0.4                 P2.1                 330 
               34 P0.5                                      330 
               33 P0.6                             23       330 
               32 P0.7                 P2.2                 330 

                                                   24
                                       P2.3

                                                   25
                                       P2.4

                                                   26
                                       P2.5

                                                   27
                                       P2.6

                                                   28
                                       P2.7

                                       Vcc

                     P                                 10k

Vcc            1 1.0                   P3.0
               2 P1.1                              10
      330     3 P1.2
      330     4 P1.3                  P3.1
      330     5 P1.4                              11
      330     6 P1.5
      330     7 P1.6                  P3.2
      330     8 P1.7                              12
      330 
      330                             P3.3
                                                   13

                                       P3.4
                                                   14

                                       P3.5
                                                   15

                                       P3.6
                                                   16

                                       P3.7
                                                   17
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