r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 594

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

Section 10 I/O Ports
10.7
Port 8 is a 6-bit I/O port that also has other functions. Port 8 has the following registers. For the
port function control registers, refer to section 10.18, Port Function Control Registers.
• Port 8 data direction register (P8DDR)
• Port 8 data register (P8DR)
• Port 8 register (PORT8)
• Port 8 open drain control register (P8ODR)
• Port function control register 3 (PFCR3)
10.7.1
The individual bits of P8DDR specify input or output for the pins of port 8. P8DDR cannot be
read; if it is, an undefined value will be read.
Rev. 1.00 Sep. 19, 2008 Page 564 of 1342
REJ09B0467-0100
Bit
7, 6
5
4
3
2
1
0
Bit Name

P85DDR
P84DDR
P83DDR
P82DDR
P81DDR
P80DDR
Port 8
Port 8 Data Direction Register (P8DDR)
Initial Value
All 0
0
0
0
0
0
0
R/W

W
W
W
W
W
W
Description
Reserved
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.
Bits 4, 2, and 0 are reserved in the H8S/2454
Group.