HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 299
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HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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9.12.2 Register Descriptions
Table 9-20 summarizes the registers of port B.
Table 9-20 Port B Registers
Address*
H'FFD4
H'FFD6
Note: * Lower 16 bits of the address.
Port B Data Direction Register (PBDDR): PBDDR is an 8-bit write-only register that can select
input or output for each pin in port B. When pins are used for TPC output, the corresponding
PBDDR bits must also be set.
A pin in port B becomes an output pin if the corresponding PBDDR bit is set to 1, and an input
pin if this bit is cleared to 0.
PBDDR is a write-only register. Its value cannot be read. All bits return 1 when read.
PBDDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a PBDDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Bit
Initial value
Read/Write
Name
Port B data direction register
Port B data register
PB DDR
7
W
7
0
PB DDR
6
W
6
0
PB DDR
5
W
5
0
Port B data direction 7 to 0
These bits select input or output for port B pins
PB DDR
286
4
W
4
0
Abbreviation
PBDDR
PBDR
PB DDR
3
W
3
0
PB DDR
2
W
2
0
R/W
W
R/W
PB DDR
1
W
1
0
Initial Value
H'00
H'00
PB DDR
0
W
0
0
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