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6-5 計時/計數器實例

1. 利用模式 1 做為計時，其電路圖如下：

20P 19

20P 12MHz X1

8.2K 18 X2
Vcc
Vcc EA
31 VP
330 
330  9 RESET
330 
330  39 P0.0 21 Vcc
330  38 P0.1 P2.0
330  37 P0.2 330 
330  36 P0.3 22 330 
330  35 P0.4 P2.1 330 
34 P0.5 330 
Vcc 33 P0.6 23 330 
32 P0.7 P2.2 330 
330  330 
330  1 24 330 
330  2 P1.0 P2.3
330  3 P1.1 Vcc
330  4 P1.2 25
330  5 P1.3 P2.4 330 
330  6 P1.4 330 
330  7 P1.5 26 330 
8 P1.6 P2.5 330 
330 
P1.7 27 330 
P2.6 330 
330 
28
P2.7

10
P3.0

11
P3.1

12
P3.2

13
P3.3

14
P3.4

15
P3.5

16
P3.6

17
P3.7