HD64F38602R Datasheet, PDF (161/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 8 I/O Ports
8.3.1 Port Data Register 8 (PDR8)
PDR8 is a register that stores data of port 8.
Bit
7 to 5
Initial
Bit Name Value R/W



4
P84
3
P83
2
P82
1, 0

0
R/W
0
R/W
0
R/W


Description
Reserved
The read value is undefined. These bits cannot be
modified.
If port 8 is read while PCR8 bits are set to 1, the values
stored in PDR8 are read, regardless of the actual pin
states. If port 8 is read while PCR8 bits are cleared to 0,
the pin states are read.
Reserved
The read value is undefined. These bits cannot be
modified.
8.3.2 Port Control Register 8 (PCR8)
PCR8 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 8.
Bit
7 to 5
Initial
Bit Name Value R/W



4
PCR84 0
W
3
PCR83 0
W
2
PCR82 0
W
1, 0



Description
Reserved
The read value is undefined. These bits cannot be
modified.
Setting a PCR8 bit to 1 makes the corresponding pin
(P84 to P82) an output pin, while clearing the bit to 0
makes the pin an input pin. The settings in PCR8 and in
PDR8 are valid when the corresponding pin is
designated as a general I/O pin.
PCR8 is a write-only register. The read value is
undefined.
Reserved
The read value is undefined. These bits cannot be
modified.
Rev. 3.00 May 15, 2007 Page 129 of 516
REJ09B0152-0300