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CHAPTER 10 I/O PORTS
10.2.1 Port Data Register (PDR)
Note that R/W for I/O ports differ from R/W for memory in the following points:
• Input mode
Read: The level at the corresponding pin is read.
Write: Data is written to an output latch.
• Output mode
Read: The port data register latch value is read.
Write: Data is written to an output latch and outputted to the corresponding pin.
Figure 10.2-2 shows the port data registers (PDR).
■ Port Data Register (PDR)
Figure 10.2-2 Port Data Registers (PDR)
P27 P26 P25 P24 P23 P22 P21 P20
P44 P43 P42 P41 P40
P54 P53 P52 P51 P50
P67 P66 P65 P64 P63 P62 P61 P60
P87 P86 P85 P84 P83 P82 P80
P57 P56 P55
76543210
76543210
76543210
76543210
76543210
Bit No.
Reset value Access
Undefined R/W
Undefined R/W
Undefined R/W
Undefined R/W
Undefined R/W
Bit No.
Bit No.
Bit No.
Bit No.
PDR2
Address: 000002
H
PDR4
Address: 000004
H
PDR5
Address: 000005
H
PDR6
Address: 000006
H
PDR8
Address: 000008
H