Datasheet

Pinout and Signal Description
MC9S12DP256 — Revision 1.1
Pinout and Signal Description
clearing a bit in DDRK makes the corresponding bit in port K an input.
The default reset state of DDRK is all zeroes.
NOTE: The ports H, J, M, P, S, T can be configured in a very flexible way. For a
full and detailed overview refer to Section Port Integration Module.
Port M for MSCAN
and BDLC
There are four identical MSCAN ports and a BDLC module sharing the
multiplex port M. The port pins act as general purpose I/O if MSCAN and
BDLC are disabled.
ATD PORT This port is an analog input interface to the analog-to-digital subsystem.
The digital function of the ports must explicitly be enabled on per pin
basis using a control register in the ADC module. When the port data
registers are read, they contain the digital levels appearing on the input
pins at the time of the read. Input pins with signal potentials not meeting
V
IL
or V
IH
specifications will have an indeterminate value.
Use of any ATD port pin except ETRIG for digital input does not preclude
the use of any other port pin for analog input. Note that the digital/analog
multiplexing function is performed in the input pad. The port registers are
connected to the input pads through tristate buffers. These buffers are
only activated when the port is configured as digital pin so that analog
signal potentials on the input pins will not cause the buffers to draw
excess supply current.
Port S for SCI0, SCI1
and SPI0
There are two identical SCI ports. Each SCI module uses two external
pins. The RxD0, RxD1 and TxD0, TxD1pins share general purpose port
SCI P[3:0]. TxD0, TxD1 are available for general-purpose I/O when it is
not configured for transmitter operation. RxD0, RxD1 are available for
general-purpose I/O when it is not configured for receiver operation.
The SPI0 module uses four external pins. SS0
, SCK0, MOSI0, and
MISO0 pins share general purpose port PS[7:4].
Timer Port The timer module has eight external pins: PT[7:0]_IOC[7:0], for input
capture and output compare functions. Two of the pins are also the pulse
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Freescale Semiconductor, Inc.
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