Datasheet

Port Integration Module
MC9S12DP256 — Revision 1.1
Port Integration Module
associated with the fifth CAN module and the IIC interface
1
. Ports P, H
and J can also be used as external interrupt sources.
Each I/O pin can be configured by several registers: Input/output
selection, drive strength reduction, enable and select of pull resistors,
interrupt enable and status flags.
The port integration module is device dependant which is reflected in its
naming.
A standard port has the following minimum features:
• Input/output selection
• 5V output drive with two selectable drive strength
• 5V digital and analog input
• Input with selectable pull-up or pull-down device
Optional features:
• Open drain for wired-or connections
• Interrupt inputs with glitch filtering
1. The port control register addresses are allocated in the order of their most likely occurrence,
i.e. almost all STAR12 derivatives will have a timer port, and a very limited number will have a
IIC module. This allows best consistency in the address allocation.
Table 41 Port Reset State and Priority Summary
Port
Reset States
Priority
Data
Direction
Pull Mode Red. Drive
Wired-Or
Mode
Inter-
rupt
T input hiz disabled n/a n/a ECT > GPIO
S input pull-up disabled disabled n/a SCI, SPI > GPIO
M input hiz disabled disabled n/a CAN > BDLC > GPIO
P input hiz disabled n/a disabled PWM > SPI > GPIO
H input hiz disabled n/a disabled GPIO
J input pull-up disabled n/a disabled CAN > IIC > GPIO
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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