SH7730 Datasheet, PDF (961/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 28 I/O Port
28.16 Port R
Port R is an input/output port with the pin configuration shown in figure 28.15. Each pin has an
input pull-up MOS, which is controlled by the port R control register (PRCR) in the PFC.
Port R
PTR2 (input/output)/SCIF1_TXD (outout)/IrDA1_TXD (output)
PTR1 (input)/SCIF1_RXD (input)/IrDA1_RXD (input)
PTR0 (input/output)/SCIF1_SCK (input/output)
Figure 28.15 Port R
28.16.1 Port R Data Register (PRDR)
PRDR is a register that stores data for pins PTR2 to PTR0. Bits PR2DT to PR0DT correspond to
pins PTR2 to PTR0. For pins that function as general-purpose output pins, a read operation
directly reads out the value from this register. When the function is a general-purpose input pins, a
read operation reads out the level on the corresponding pin.
Bit: 7
6
5
4
3
2
1
0
— — — — — PR2DT PR1DT PR0DT
Initial value: 0
0
0
0
0
0
0
0
R/W: R R R R R R/W R R/W
Bit
Bit Name
7 to 3 
2
PR2DT
1
PR1DT
0
PR0DT
Initial
Value R/W
All 0 R
0
R/W
0
R
0
R/W
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Table 28.17 shows the function of PRDR.
Rev. 1.00 Sep. 19, 2007 Page 913 of 1136
REJ09B0359-0100