HD6432633 Datasheet, PDF (464/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

10A.9.2 Register Configuration
Table 10A-14 shows the port C register configuration.
Table 10A-14 Port C Registers
Name
Abbreviation R/W
Port C data direction register
PCDDR
W
Port C data register
PCDR
R/W
Port C register
PORTC
R
Port C MOS pull-up control register PCPCR
R/W
Port C open-drain control register
PCODR
R/W
Note: * Lower 16 bits of the address.
Initial Value
H'00
H'00
Undefined
H'00
H'00
Address*
H'FE3B
H'FF0B
H'FFBB
H'FE42
H'FE49
Port C Data Direction Register (PCDDR)
Bit
:
7
6
5
4
3
2
1
0
PC7DDR PC6DDR PC5DDR PC4DDR PC3DDR PC2DDR PC1DDR PC0DDR
Initial value :
0
0
0
0
0
0
0
0
R/W
:W
W
W
W
W
W
W
W
PCDDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port C. PCDDR cannot be read; if it is, an undefined value will be read.
PCDDR is initialized to H'00 by a power-on reset, and in hardware standby mode. It retains its
prior state by a manual reset or in software standby mode. The OPE bit in SBYCR is used to select
whether the address output pins retain their output state or become high-impedance when the
mode is changed to software standby mode.
• Modes 4 and 5
The corresponding port C pins are address outputs irrespective of the value of the PCDDR bits.
• Mode 6
Setting a PCDDR bit to 1 makes the corresponding port C pin an address output, while
clearing the bit to 0 makes the pin an input port.
• Mode 7
Setting a PCDDR bit to 1 makes the corresponding port C pin an output port, while clearing
the bit to 0 makes the pin an input port.
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