HD6432621 Hitachi, HD6432621 Datasheet - Page 286

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

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.
Port B Register (PORTB)
Note: * Determined by state of pins PB7 to PB0.
PORTB is an 8-bit read-only register that shows the pin states. It cannot be written to. Writing of
output data for the port B pins (PB7 to PB0) must always be performed on PBDR.
If a port B read is performed while PBDDR bits are set to 1, the PBDR values are read. If a port B
read is performed while PBDDR bits are cleared to 0, the pin states are read.
After a reset and in hardware standby mode, PORTB contents are determined by the pin states, as
PBDDR and PBDR are initialized. PORTB retains its prior state in software standby mode.
242
Bit
Initial value :
R/W
Bit
Initial value :
R/W
:
:
:
:
PB7DR
R/W
PB7
—*
7
0
7
R
PB6DR
R/W
PB6
—*
6
0
6
R
PB5DR
R/W
PB5
—*
5
0
5
R
PB4DR
R/W
PB4
—*
4
0
4
R
PB3DR
R/W
PB3
—*
3
0
3
R
PB2DR
R/W
PB2
—*
2
0
2
R
PB1DR
R/W
PB1
—*
1
0
1
R
PB0DR
R/W
PB0
—*
0
0
0
R