r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 532

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 I/O Ports
10.1
Port 1 is an 8-bit I/O port that also has other functions. Port 1 has the following registers. For the
port function control registers, refer to section 10.18, Port Function Control Registers.
• Port 1 data direction register (P1DDR)
• Port 1 data register (P1DR)
• Port 1 register (PORT1)
• Port 1 open drain control register (P1ODR)
• Port function control register 5 (PFCR5)
10.1.1
The individual bits of P1DDR specify input or output for the pins of port 1. P1DDR cannot be
read; if it is, an undefined value will be read.
Rev. 1.00 Sep. 19, 2008 Page 502 of 1342
REJ09B0467-0100
Bit
7
6
5
4
3
2
1
0
Bit Name
P17DDR
P16DDR
P15DDR
P14DDR
P13DDR
P12DDR
P11DDR
P10DDR
Port 1
Port 1 Data Direction Register (P1DDR)
Initial Value
0
0
0
0
0
0
0
0
R/W
W
W
W
W
W
W
W
W
Description
When a pin function is specified as a general
purpose I/O, setting this bit to 1 makes the
corresponding pin an output port, while clearing this
bit to 0 makes the corresponding pin an input port.