HD6432621 Hitachi, HD6432621 Datasheet - Page 308

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.8.2
Table 9-15 shows the port D register configuration.
Table 9-15 Port D Registers
Name
Port D data direction register
Port D data register
Port D register
Port D MOS pull-up control register
Note: * Lower 16 bits of the address.
Port D Data Direction Register (PDDDR)
PDDDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port D. PDDDR cannot be read; if it is, an undefined value will be read.
PDDDR is initialized to H'00 by a reset, and in hardware standby mode. It retains its prior state in
software standby mode.
264
Bit
Initial value :
R/W
Modes 4 to 6
The input/output direction specification by PDDDR is ignored, and port D is automatically
designated for data I/O.
Mode 7
Setting a PDDDR bit to 1 makes the corresponding port D pin an output port, while clearing
the bit to 0 makes the pin an input port.
Register Configuration
:
:
PD7DDR PD6DDR PD5DDR PD4DDR PD3DDR PD2DDR PD1DDR PD0DDR
W
7
0
W
6
0
Abbreviation
PDDDR
PDDR
PORTD
PDPCR
W
5
0
W
4
0
R/W
W
R/W
R
R/W
W
3
0
Initial Value
H'00
H'00
Undefined
H'00
W
2
0
W
1
0
Address*
H'FE3C
H'FF0C
H'FFBC
H'FE43
W
0
0