H836024 Datasheet, PDF (138/384 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 9 I/O Ports
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. The P80/FTCI pin 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
P84/FTIOD
P83/FTIOC
P82/FTIOB
P81/FTIOA
P80/FTCI
Figure 9.5 Port 8 Pin Configuration
Port 8 has the following 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.
Initial
Bit
Bit Name Value R/W Description
7 to 5 


Reserved
4
PCR84 0
3
PCR83 0
2
PCR82 0
1
PCR81 0
W
When each of the port 8 pins P84 to P80 functions as an
W
general I/O port, setting a PCR8 bit to 1 makes the
corresponding pin an output port, while clearing the bit to
W
0 makes the pin an input port.
W
0
PCR80 0
W
Rev. 4.00 Sep. 23, 2005 Page 112 of 354
REJ09B0025-0400