HD6433044 Datasheet, PDF (276/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Port 6 Data Direction Register (P6DDR): P6DDR is an 8-bit write-only register that can select
input or output for each pin in port 6.
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
— P6₆DDR P6₅DDR P6₄DDR P6₃DDR P6₂DDR P6₁DDR P6₀DDR
1
0
0
0
0
0
0
0
—
W
W
W
W
W
W
W
Reserved bit
Port 6 data direction 6 to 0
These bits select input or output for port 6 pins
Modes 1 to 6 (Expanded Modes): P6₆ to P6₃ function as bus control output pins (LWR, HWR,
RD, AS). P6₂ to P6₀ are generic input/output pins, functioning as output port when bits P6₂DDR
to P6₀DDR are set to 1 and input port when these bits are cleared to 0.
Mode 7 (Single-Chip Mode): Port 6 is a generic input/output port. A pin in port 6 becomes an
output port if the corresponding P6DDR bit is set to 1, and an input port if this bit is cleared to 0.
Bit 7 is reserved.
P6DDR is a write-only register. Its value cannot be read. All bits return 1 when read.
P6DDR is initialized to H'80 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a P6DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Port 6 Data Register (P6DR): P6DR is an 8-bit readable/writable register that stores output data
for pins P6₆ to P6₀. When a bit in P6DDR is set to 1, if port 6 is read the value of the
corresponding P6DR bit is returned. When a bit in P6DDR is cleared to 0, if port 6 is read the
corresponding pin level is read.
Bit
7
6
5
4
3
2
1
0
—
P6 ₆
P6 ₅
P6 ₄
P6 ₃
P6 ₂
P6 ₁
P6 ₀
Initial value
1
0
0
0
0
0
0
0
Read/Write
—
R/W R/W
R/W R/W
R/W
R/W R/W
Reserved bit
Port 6 data 6 to 0
These bits store data for port 6 pins
Bit 7 is reserved, cannot be modified, and always read as 1.
P6DR is initialized to H'80 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
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