Datasheet

Section 10 I/O Ports
R01UH0309EJ0500 Rev. 5.00 Page 523 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
10.1 Port 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 Port 1 Data Direction Register (P1DDR)
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.
Bit Bit Name Initial Value R/W Description
7 P17DDR 0 W
6 P16DDR 0 W
5 P15DDR 0 W
4 P14DDR 0 W
3 P13DDR 0 W
2 P12DDR 0 W
1 P11DDR 0 W
0 P10DDR 0 W
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.