r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 682

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

Section 10 I/O Ports
10.17
Note: Port J is not supported in the H8S/2454 Group and in the 145-pin package.
Port J is a 3-bit I/O port. Port J has the following registers.
• Port J data direction register (PJDDR)
• Port J data register (PJDR)
• Port J register (PORT3)
• Port J open drain control register (PJODR)
10.17.1 Port J Data Direction Register (PJDDR)
The individual bits of PJDDR specify input or output for the pins of port J. PJDDR cannot be read;
if it is, an undefined value will be read.
10.17.2 Port J Data Register (PJDR)
PJDR stores output data for the port J pins.
Rev. 1.00 Sep. 19, 2008 Page 652 of 1342
REJ09B0467-0100
Bit
7 to 2
1
0
Bit
7 to 2
1
0
Bit Name

PJ1DR
PJ0DR
Bit Name

PJ1DDR
PJ0DDR
Port J
Initial Value
All 0
0
0
Initial Value
All 0
0
0
R/W

W
W
R/W

R/W
R/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.
Description
Reserved
These bits are always read as 0 and cannot be
modified.
Output data for a pin is stored when the pin function
is specified as a general purpose I/O.