HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 276

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HD6433044

Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet

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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.
Modes 1 to 6 (Expanded Modes): P6
RD, AS). P6
to P6
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 P6
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 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.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
0
DDR are set to 1 and input port when these bits are cleared to 0.
6
2
to P6
to P6
Reserved bit
Reserved bit
0
. When a bit in P6DDR is set to 1, if port 6 is read the value of the
0
7
1
7
1
are generic input/output pins, functioning as output port when bits P6
P6 DDR
R/W
P6
6
W
6
0
6
0
6
P6 DDR
6
R/W
P6
5
to P6
W
5
0
5
0
5
3
function as bus control output pins (LWR, HWR,
P6 DDR
263
Port 6 data direction 6 to 0
These bits select input or output for port 6 pins
R/W
P6
4
W
4
0
4
0
4
Port 6 data 6 to 0
These bits store data for port 6 pins
P6 DDR
R/W
P6
3
W
3
0
3
0
3
P6 DDR
R/W
P6
2
W
2
0
2
0
2
P6 DDR
R/W
P6
1
W
1
0
1
0
1
P6 DDR
R/W
P6
0
W
2
0
0
0
0
DDR
0

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