r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1463

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

28.2.32 Port R Data Register (PRDR)
PRDR is an 8-bit readable/writable register that stores port R data.
Note:
Bit
7 to 4
3
2
1
0
*
Bit Name
⎯
PR3DT
PR2DT
PR1DT
PR0DT
When the bus mode is set to DU by the bus mode pins (MODE11 and MODE12), the
pin is initially used as a general-purpose input, and the pin status is read from this
register.
Initial value:
Initial
value
All 0
0*
0*
0*
0*
R/W:
Bit:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
—
7
0
R/W
—
6
0
Description
Reserved
These bits are always read as 0, and the write value
should always be 0.
These bits store output data of a pin which is used as a
general-purpose output port. When the pin functions as
a general-purpose output port, reading the port will read
out the value of the corresponding bit of this register.
When the pin functions as a general-purpose input port,
reading the port will read out the status of the
corresponding pin.
R/W
—
5
0
R/W
—
4
0
PR3DT
R/W
3
0
Rev.1.00 Jan. 10, 2008 Page 1433 of 1658
PR2DT
R/W
2
0
28. General Purpose I/O Ports (GPIO)
PR1DT
R/W
1
0
PR0DT
R/W
0
0
REJ09B0261-0100