MC9S12T64 Datasheet, PDF (267/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Port Integration Module (PIM)
Functional Description
Port P Polarity
Select Register
(PPSP)
Address Offset: $00F5
Bit 7
Read:
PPSP7
Write:
Reset: 0
6
5
4
PPSP6 PPSP5 PPSP4
0
0
0
= Reserved or unimplemented
3
PPSP3
0
2
PPSP2
0
1
PPSP1
0
Bit 0
PPSP0
0
Read: Anytime.
Write: Anytime.
This register selects a pull-up or a pull-down device if enabled.
PPSP[7:0] — Polarity Select Port P
1 = A pull-down device is connected to the associated port P pin, if
enabled by the associated bit in register PERP and if the port
is used as input.
0 = A pull-up device is connected to the associated port P pin, if
enabled by the associated bit in register PERP and if the port
is used as input.
Functional Description
General
I/O register
Each pin can act as general purpose I/O. In addition the pin can act as
an output or as an input of a peripheral module. A set of configuration
registers is common to all ports. All registers can be written at any time,
however certain configurations might not become active.
Example:
Selecting a pull-up resistor. This resistor does not become active while
the port is used as a push-pull output.
This register holds the value driven out to the pin if the port is used as a
general purpose I/O. Writing to this register has only an effect on the pin
Port Integration Module (PIM)
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MC9S12T64Revision 1.1.1