ST10F269Z2QX View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST10F269Z2QX Datasheet PDF : 161 Pages
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ST10F269Z2Qx
12.4 - PORT1
The two 8-bit ports P1H and P1L represent the higher and lower part of PORT1, respectively. Both halves
of PORT1 can be written (via a PEC transfer) without effecting the other half.
If this port is used for general purpose I/O, the direction of each line can be configured via the
corresponding direction registers DP1H and DP1L.
P1L (FF04h / 82h)
15 14 13 12 11 10 9
-
-
-
-
-
-
-
SFR
Reset Value: --00h
8
7
6
5
4
3
2
1
0
- P1L.7 P1L.6 P1L.5 P1L4 P1L.3 P1L.2 P1L.1 P1L.0
RW RW RW RW RW RW RW RW
P1H (FF06h / 83h)
15 14 13 12 11 10 9
-
-
-
-
-
-
-
SFR
Reset Value: --00h
8
7
6
5
4
3
2
1
0
- P1H.7 P1H.6 P1H.5 P1H.4 P1H.3 P1H.2 P1H.1 P1H.0
RW RW RW RW RW RW RW RW
P1X.y
Port Data Register P1H or P1L Bit y
DP1L (F104h / 82h)
15 14 13 12 11 10 9
-------
ESFR
Reset Value: --00h
8
7
6
5
4
3
2
1
0
- DP1L.7 DP1L.6 DP1L.5 DP1L.4 DP1L.3 DP1L.2 DP1L.1 DP1L.0
RW RW RW RW RW RW RW RW
DP1H (F106h / 83h)
15 14 13 12 11 10 9
-------
ESFR
Reset Value: --00h
8
7
6
5
4
3
2
1
0
- DP1H.7 DP1H.6 DP1H.5 DP1H.4 DP1H.3 DP1H.2 DP1H.1 DP1H.0
RW RW RW RW RW RW RW RW
DP1X.y
Port Direction Register DP1H or DP1L Bit y
DP1X.y = 0: Port line P1X.y is an input (high-impedance)
DP1X.y = 1: Port line P1X.y is an output
12.4.1 - Alternate Functions of PORT1
When a demultiplexed external bus is enabled, PORT1 is used as address bus.
Note: Demultiplexed bus modes use PORT1 as a 16-bit port. Otherwise all 16 port lines can be used for
general purpose I/O.
The upper 4 pins of PORT1 (P1H.7...P1H.4) are used as capture input lines (CC27IO...CC24IO).
During external accesses in demultiplexed bus modes PORT1 outputs the 16-bit intra-segment address
as an alternate output function.
During external accesses in multiplexed bus modes, when no BUSCON register selects a demultiplexed
bus mode, PORT1 is not used and is available for general purpose I/O.
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