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Chapter 4 I/O Ports
Port 5
R
D
L
Q
Reset
Write
Read
R
D
L
Q
Reset
Write
Read
D
L
Q
Write
Read
Read
R
Reset
Pull-up resistor control
I/O direction control
Port output data
SC4AD1 register
SELI2C flag
Serial interface 4 clock output
Serial interface 4 clock input
Port input data
Data bus
0
1
P54
P5PLU4
P5DIR4
P5OUT4
P5IN4
Read
R
D
L
Q
Reset
Write
SC4ODC11
Nch open-drain control
M
U
X
Figure 4-5-6 Block Diagram (P54)