HD6432646 Hitachi, HD6432646 Datasheet - Page 296

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.9.2
Table 9-16 shows the port B register configuration.
Table 9-16 Port B Registers
Name
Port B data direction register
Port B data register
Port B register
Port B MOS pull-up control register
Port B open-drain control register
Note: * Lower 16 bits of the address.
Port B Data Direction Register (PBDDR)
PBDDR is an 8-bit write-only register, the individual bits of which specify input or output for the
pins of port B. PBDDR cannot be read; if it is, an undefined value will be read.
PBDDR is initialized to H'00 by a reset, and in hardware standby mode. It retains its prior state 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 a transition is made to software standby
mode.
Port B Data Register (PBDR)
PBDR is an 8-bit readable/writable register that stores output data for the port B pins (PB7 to
PB0). PBDR is initialized to H'00 by a reset, and in hardware standby mode. It retains its prior
state in software standby mode.
262
Bit
Initial value :
R/W
Bit
Initial value :
R/W
Register Configuration
:
:
:
:
PB7DDR PB6DDR PB5DDR PB4DDR PB3DDR PB2DDR PB1DDR PB0DDR
PB7DR
R/W
W
7
0
7
0
PB6DR
R/W
W
6
0
6
0
PB5DR
Abbreviation
PBDDR
PBDR
PORTB
PBPCR
PBODR
R/W
W
5
0
5
0
PB4DR
R/W
W
4
0
4
0
R/W
W
R/W
R
R/W
R/W
PB3DR
R/W
W
3
0
3
0
Initial Value
H'00
H'00
Undefined
H'00
H'00
PB2DR
R/W
W
2
0
2
0
PB1DR
R/W
W
1
0
1
0
Address*
H'FE3A
H'FF0A
H'FFBA
H'FE41
H'FE48
PB0DR
R/W
W
0
0
0
0