Port A; Port A Data Direction Register (Paddr) - Renesas H8S Series Hardware Manual

8.10

Port A

Port A is an 8-bit I/O port. Port A pins also function as the keyboard input pins and KBU
input/output pins. The output format for port A is NMOS push-pull output.
Port A has the following registers. PADDR and PAPIN have the same address.

• Port A data direction register (PADDR)

• Port A output data register (PAODR)
• Port A input data register (PAPIN)
8.10.1 Port A Data Direction Register (PADDR)
The individual bits of PADDR specify input or output for the pins of port A.
Bit Bit Name
7 PA7DDR
6 PA6DDR
5 PA5DDR
4 PA4DDR
3 PA3DDR
2 PA2DDR
1 PA1DDR
0 PA0DDR
Initial Value R/W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
Description
The corresponding port A pins are output ports
when the PADDR bits are set to 1, and input ports
when cleared to 0.
Rev. 3.00 Jul. 14, 2005 Page 201 of 986
Section 8 I/O Ports
REJ09B0098-0300