Chapter 2 Port Integration Module (S12XEP100PIMV1)
MC9S12XE-Family Reference Manual , Rev. 1.19
90
Freescale Semiconductor
Most I/O pins can be configured by register bits to select data direction and drive strength, to enable and
select pull-up or pull-down devices.
NOTE
This document assumes the availabitity of all features (208-pin package
option). Some functions are not available on lower pin count package
options. Refer to the pin-out summary in the SOC Guide.
2.1.2
Features
The Port Integration Module includes these distinctive registers:
•
Data and data direction registers for Ports A, B, C, D, E, K, T, S, M, P, H, J, AD0, AD1, R, L, and
F when used as general-purpose I/O
•
Control registers to enable/disable pull-device and select pull-ups/pull-downs on Ports T, S, M, P,
H, J, R, L, and F on per-pin basis
•
Control registers to enable/disable pull-up devices on Ports AD0 and AD1 on per-pin basis
•
Single control register to enable/disable pull-ups on Ports A, B, C, D, E, and K on per-port basis
and on BKGD pin
•
Control registers to enable/disable reduced output drive on Ports T, S, M, P, H, J, AD0, AD1, R, L,
and F on per-pin basis
•
Single control register to enable/disable reduced output drive on Ports A, B, C, D, E, and K on per-
port basis
•
Control registers to enable/disable open-drain (wired-or) mode on Ports S, M, and L
•
Interrupt flag register for pin interrupts on Ports P, H, and J
•
Control register to configure IRQ pin operation
•
Free-running clock outputs
A standard port pin has the following minimum features:
•
Input/output selection
•
5V output drive with two selectable drive strengths
•
5V digital and analog input
•
Input with selectable pull-up or pull-down device
Optional features supported on dedicated pins:
•
Open drain for wired-or connections
•
Interrupt inputs with glitch filtering
•
Reduced input threshold to support low voltage applications
2.2
External Signal Description
This section lists and describes the signals that do connect off-chip.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages
