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INPUT/OUTPUT PORTS
199
READ
N
OFF
P2ON
R=10kΩ
.
.
VCC
INTERNAL
BUS
(A) "1" data writing equivalent circuit
P3ON
R=100kΩ
.
.
READ
N
OFF
P2ON
R=10kΩ
.
.
VCC
INTERNAL
BUS
(B) "1" data input equivalent circuit
P3ON
R=100kΩ
.
.
IIH
OFF
ON
10kΩ
VCC
READ
N
OFF
P2OFF
R=10kΩ
.
.
VCC
INTERNAL
BUS
(C) "0" data input equivalent circuit
P3ON
R=100kΩ
.
.
IOH
ON
OFF
10kΩ
VCC
Figure 5-7 Quasi-bidirectional port input equivalent circuit