MCF5270 FREESCALE [Freescale Semiconductor, Inc], MCF5270 Datasheet - Page 12

• Manufacturer Part Number: MCF5270
• Description: 32-bit Embedded Controller Division
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Signal Descriptions
3.20 GPIO
Unused bus interface and peripheral pins on the MCF5271 can be used as discrete general-purpose inputs
and outputs. These are managed by a dedicated GPIO module that logically groups all pins into ports
located within a contiguous block of memory-mapped control registers.
All of the pins associated with the external bus interface may be used for several different functions. Their
primary function is to provide an external memory interface to access off-chip resources. When not used
for this, all of the pins may be used as general-purpose digital I/O pins. In some cases, the pin function is
set by the operating mode, and the alternate pin functions are not supported.
The digital I/O pins on the MCF5271 are grouped into 8-bit ports. Some ports do not use all eight bits.
Each port has registers that configure, monitor, and control the port pins.
4
This section describes signals that connect off chip, including a table of signal properties. For a more
detailed discussion of the MCF5271 signals, consult the MCF5235 Reference Manual (MCF5235RM).
4.1
Table 2
function of the pin. Refer to
12
lists all of the signals grouped by function. The “Dir” column is the direction for the primary
Signal Descriptions
Signal Properties
Signal Name
RSTOUT
In this table and throughout this document a single signal within a group is
designated without square brackets (i.e., A24), while designations for
multiple signals within a group use brackets (i.e., A[23:21]) and is meant to
include all signals within the two bracketed numbers when these numbers
are separated by a colon.
The primary functionality of a pin is not necessarily its default functionality.
Pins that are muxed with GPIO will default to their GPIO functionality.
RESET
EXTAL
XTAL
Table 2. MCF5270 and MCF5271 Signal Information and Muxing
MCF5271 Integrated Microprocessor Hardware Specification, Rev. 1.2
Section 7, “Mechanicals/Pinouts and Part
GPIO
—
—
—
—
Alternate 1 Alternate 2 Dir.
—
—
—
—
NOTE
NOTE
Reset
Clock
—
—
—
—
O
O
I
I
1
MCF5270
MCF5271
160 QFP
83
82
86
85
Numbers,” for package diagrams.
196 MAPBGA
MCF5270
MCF5271
M14
N13
N14
P13
Freescale Semiconductor