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这是一个计数器原理图

[
U1

SR4CLED



]
[
U2

OR2B2



]
[
U3

INV



]
[
U4

INV



]
[
U5

INV



]
[
U6

INV



]
[
U7

INV



]
[
U8

FJKC



]
[
U9

FJKC



]
(
GND
U1-CLR
U1-D0
U1-D1
U1-D2
U1-D3
U8-CLR
U9-CLR
)
(
NetU1_C
U1-C
U8-C
U9-C
)
(
NetU1_CE
U1-CE
U8-Q
)
(
NetU1_LEFT
U1-LEFT
U9-Q
)
(
NetU1_SLI
U1-SLI
U3-O
)
(
NetU1_SRI
U1-SRI
U4-O
)
(
NetU2_I0
U2-I0
U6-I
)
(
NetU2_I1
U2-I1
U7-I
)
(
NetU2_O
U2-O
U8-J
)
(
NetU5_O
U5-O
U8-K
)
(
NetU6_O
U6-O
U9-J
)
(
NetU7_O
U7-O
U9-K
)
(
Q0
U1-Q0
U4-I
)
(
Q3
U1-Q3
U3-I
)