Port F; Port F Data Direction Register (Pfddr) - Renesas H8S Series Hardware Manual

9.8

Port F

Port F is an 8-bit I/O port that also has other functions. Port F has the following registers. For
details on register addresses and register states during each processing, refer to appendix A, On-
Chip I/O Register.

• Port F data direction register (PFDDR)

• Port F data register (PFDR)
• Port F register (PORTF)
9.8.1 Port F Data Direction Register (PFDDR)
PFDDR is an 8-bit write-only register, the individual bits of which specify whether the pins of port
F are used for input or output.
PFDDR cannot be read; if it is, an undefined value will be read.
Bit Bit Name
7 PF7DDR
6 PF6DDR
5 PF5DDR
4 PF4DDR
3 PF3DDR
2 PF2DDR
1 PF1DDR
0 PF0DDR
Initial Value R/W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
0 W
Description
When a pin is specified as a general purpose I/O
port, setting this bit to 1 makes the PF7 pin a φ
output pin. Clearing this bit to 0 makes the pin an
input pin.
When a pin is specified as a general purpose I/O
port, setting this bit to 1 makes the corresponding
port F pin an output pin. Clearing this bit to 0 makes
the pin an input pin.
Rev. 6.00 Mar 15, 2006 page 155 of 570
Section 9 I/O Ports
REJ09B0211-0600