出租车里程计价表(8)

101

U49A &

105

108 5V 109U57 1A VCC 1B 4B 1Y 4A 2A 4Y 2B 3B 2Y 3A GND 3Y

7420N

VCC 124 123

16

14 13 12 11

15

110& & U51 ~LOAD ~CLR

111& U56A

112U54A &

113U55A

74LS32D

VCC

CLK GND

ENP ENT

128 126A B C D 3 4 5 6

RCO

QA QB QC QD

74LS160D

U52A

7400N 117

7409N 116

7409N 114

7409N 115

01 2 3 4 5 6 7 8

J14

J15

J16

J17

Key = Space Key = Space Key = Space Key = Space 120 119 118U58A &

U59 1CLK VCC 16 1K ~1CLR 15 1J ~2CLR 14 ~1PRE 2CLK 13 1Q 2K 12 ~1Q 2J 11 ~2Q ~2PRE 10 GND 2Q 9

7 10

2 8

9 1

74LS112D 122

121

7420N

&

0

Key = Space Key = Space Key = Space Key = Space

U62A

74LS112D

7409N