HD64F3687HV Datasheet, PDF (149/538 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 9 I/O Ports
9.2 Port 2
Port 2 is a general I/O port also functioning as SCI3 I/O pins. Each pin of the port 2 is shown in
figure 9.2. The register settings of PMR1and SCI3 have priority for functions of the pins for both
uses.
Port 2
P24
P23
P22/TXD
P21/RXD
P20/SCK3
Figure 9.2 Port 2 Pin Configuration
Port 2 has the following registers.
• Port control register 2 (PCR2)
• Port data register 2 (PDR2)
• Port mode register 3 (PMR3)
9.2.1 Port Control Register 2 (PCR2)
PCR2 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 2.
Bit
7 to 5
4
3
2
1
0
Bit Name

PCR24
PCR23
PCR22
PCR21
PCR20
Initial
Value

0
0
0
0
0
R/W

W
W
W
W
W
Description
Reserved
When each of the port 2 pins P24 to P20 functions as a
general I/O port, setting a PCR2 bit to 1 makes the
corresponding pin an output port, while clearing the bit to
0 makes the pin an input port.
Rev.5.00 Nov. 02, 2005 Page 115 of 500
REJ09B0027-0500