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MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 193
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Chapter 9
Rapid GPIO (RGPIO)
9.1 Introduction
The Rapid GPIO (RGPIO) module provides a 16-bit general-purpose I/O module directly connected to the
processor’s high-speed 32-bit local platform bus. This connection to the processor’s high-speed platform
bus plus support for single-cycle, zero wait-state data transfers allows the RGPIO module to provide
improved pin performance when compared to more traditional GPIO modules located on the internal slave
peripheral bus.
Many of the pins associated with a device may be used for several different functions. Their primary
functions are to provide external interfaces to access off-chip resources. When not used for their primary
function, many of the pins may be used as general-purpose digital I/O (GPIO) pins. The definition of the
exact pin functions and the affected signals is specific to each device. Every GPIO port, including the
RGPIO module, has registers that configure, monitor, and control the port pins.
Figure 9-1 shows the MCF51QE128 series block diagram with the RGPIO highlighted.