HD64F38602R Datasheet, PDF (152/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 8 I/O Ports
8.1.1 Port Data Register 1 (PDR1)
PDR1 is a register that stores data of port 1.
Initial
Bit
Bit Name Value R/W
7 to 3 


2
P12
0
R/W
1
P11
0
R/W
0
P10
0
R/W
Description
Reserved
The read value is undefined. These bits cannot be
modified.
If port 1 is read while PCR1 bits are set to 1, the values
stored in PDR1 are read, regardless of the actual pin
states. If port 1 is read while PCR1 bits are cleared to 0,
the pin states are read.
8.1.2 Port Control Register 1 (PCR1)
PCR1 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 1.
Initial
Bit
Bit Name Value R/W
7 to 3 


2
PCR12 0
W
1
PCR11 0
W
0
PCR10 0
W
Description
Reserved
The read value is undefined. These bits cannot be
modified.
Setting a PCR1 bit to 1 makes the corresponding pin
(P12 to P10) an output pin, while clearing the bit to 0
makes the pin an input pin. The settings in PCR1 and in
PDR1 are valid when the corresponding pin is
designated as a general I/O pin.
PCR3 is a write-only register. The read value is
undefined.
Rev. 3.00 May 15, 2007 Page 120 of 516
REJ09B0152-0300