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