Datasheet

12 - PARALLEL PORTS ST10F269
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12.11 - Port 8
If this 8-bit port is used for general purpose I/O,
the direction of each line can be configured via the
corresponding direction register DP8. Each port
line can be switched into push/pull or open drain
mode via the open drain control register ODP8.
P8 (FFD4h / EAh) SFR Reset Value: --00h
DP8 (FFD6h / EBh) SFR Reset Value: --00h
ODP8 (F1D6h / EBh) ESFR Reset Value: --00h
1514131211109876543210
- - - - - - - - P8.7 P8.6 P8.5 P8.4 P8.3 P8.2 P8.1 P8.0
RW RW RW RW RW RW RW RW
P8.y Port Data Register P8 Bit y
1514131211109876543210
--------DP8.7DP8.6DP8.5DP8.4DP8.3DP8.2DP8.1DP8.0
RW RW RW RW RW RW RW RW
DP8.y Port Direction Register DP8 Bit y
DP8.y = 0: Port line P8.y is an input (high impedance)
DP8.y = 1: Port line P8.y is an output
1514131211109876543210
--------ODP8.7ODP8.6ODP8.5ODP8.4ODP8.3ODP8.2ODP8.1ODP8.0
RW RW RW RW RW RW RW RW
ODP8.y Port 8 Open Drain Control Register Bit y
ODP8.y = 0: Port line P8.y output driver in push-pull mode
ODP8.y = 1: Port line P8.y output driver in open drain mode