mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1169

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Chapter 45
Rapid GPIO (RGPIO)
45.1 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 bus. This connection 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.
45.1.1 Overview
The RGPIO module provides 16-bits of high-speed GPIO functionality, mapped to the
processor's bus. The key features of this module include:
Freescale Semiconductor, Inc.
• 16 bits of high-speed GPIO functionality connected to the processor's local 32-bit
• Memory-mapped device connected to the ColdFire core's local bus
bus
Most pin functions default to GPIO and must be software
configured before using RGPIO.
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Note
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