Chapter 15 gpio, 1 introduction, Chapter 15 – Freescale Semiconductor MCF5480 User Manual
Page 373: Gpio, Introduction -1, Chapter 15, “gpio
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor
15-1
Chapter 15
GPIO
15.1
Introduction
Many of the MCF548x pins whose primary function is to serve as the external interface to off-chip
resources may also be used for general-purpose digital I/O (GPIO) access and for one or two secondary
functions. When used for GPIO purposes, the port x pins (PXXX) indicate which port is being accessed. In
some cases, the pin function is set by the operating mode, and the alternate pin functions are not supported.
The MCF548x GPIO signals are grouped into 8-bit ports; however, some ports do not use all eight bits.
Each GPIO port has registers that configure, monitor, and control the port signals.
is a block diagram of the MCF548x GPIO module.
NOTE
The actual signals and functions available vary for different members of the
MCF548x family. See
Chapter 2, “Signal Descriptions,”
for more details.