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9.5
Port 8
Port 8 is a general I/O port also functioning as a Timer W I/O pin. Each pin of the port 8 is shown
in figure 9-5. The register setting of the timer W has priority for functions of the pins P84/FTIOD,
P83/FTIOC, P82/FTIOB, and P81/FTIOA. P80/FTCI also functions as a timer W input port that is
connected to the timer W regardless of the register setting of port 8.
Port 8 has the following registers. For details on register addresses and register states during each
process, refer to appendix B, Internal I/O Registers.
• Port control register 8(PCR8)
• Port data register 8(PDR8)
9.5.1
Port Control Register 8(PCR8)
PCR8 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 8.
Bit Bit Name
Initial Value R/W
−
7
0
−
6
0
−
5
0
4
PCR84
0
3
PCR83
0
2
PCR82
0
1
PCR81
0
0
PCR80
0
Rev. 1.0, 03/01, page 104 of 280
Port 8
Figure 9-5 Port 8 Pin Configuration
Description
−
Reserved
−
These bits are always read as 0 and cannot be modified.
−
W
When each of the port 8 pins P87 to P80 functions as an
general I/O port, setting a PCR8 bit to 1 makes the
W
corresponding pin an output port, while clearing the bit to 0
W
makes the pin an input port.
W
W
P84/FTIOD
P83/FTIOC
P82/FTIOB
P81/FTIOA
P80/FTCI
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