HD64F38602R Datasheet, PDF (165/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 8 I/O Ports
8.4.1 Port Data Register 9 (PDR9)
PDR9 is a register that stores data of port 9.
Bit
7 to 4
Initial
Bit Name Value R/W



3
P93
0
R/W
2
P92
0
R/W
1
P91
0
R/W
0
P90
0
R/W
Description
Reserved
The read value is undefined. These bits cannot be
modified.
If port 9 is read while PCR9 bits are set to 1, the values
stored in PDR9 are read, regardless of the actual pin
states. If port 9 is read while PCR9 bits are cleared to 0,
the pin states are read.
8.4.2 Port Control Register 9 (PCR9)
PCR9 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 9.
Bit
7 to 4
Initial
Bit Name Value R/W



3
PCR93 0
W
2
PCR92 0
W
1
PCR91 0
W
0
PCR90 0
W
Description
Reserved
The read value is undefined. These bits cannot be
modified.
Setting a PCR9 bit to 1 makes the corresponding pin an
output pin, while clearing the bit to 0 makes the pin an
input pin. The settings in PCR9 and in PDR9 are valid
when the corresponding pin is designated as a general
I/O pin.
PCR9 is a write-only register. The read value is
undefined.
Rev. 3.00 May 15, 2007 Page 133 of 516
REJ09B0152-0300