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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
2-4
Freescale Semiconductor
2.2
External Signal Description
This section summarizes the external signal functions, their static electrical characteristics, and pad
configuration settings for this device.
gives a summary of the MPC5553 external signals, and
provides a summary of the MPC5554 external signals. The signal properties and their electrical
characteristics are set in the system integration unit (SIU) pad configuration registers (PCR).
Signal functions are multiplexed to each ball on the BGA in a function hierarchy: primary, main primary,
alternate, second alternate, and general-purpose input/output (I/O). For example, in the signal
PCSA[3]_SIND_GPIO[99], the primary signal function is PCSA[3], the first alternate signal function is
SIND, and the GPIO function is a generic general-purpose I/O signal. Multiplexing signal functions allows
for more flexibility when configuring the device, as well as providing compatibility with other devices in
the MPC5500 product family.
The primary signal function name is used in the ball grid array (BGA) map to identify the location of the
ball; however, the primary signal function is not always valid for all devices. As shown in
, when
the primary signal function is not available on the device, a dash appears in the following signal table
columns: signal functions, P/A/G, and I/O type.
Figure 2-3. Primary Function Not Available on Device
The P/A/G column designates the position in the signal function hierarchy for multiplexed functions.
These symbols correspond to binary values for the pin assignment (PA) field in the SIU_PCR registers that
determine the active signal function. The PA field is from 1- to 3-bits wide, depending on the PCR register.
explains the symbol definitions used in the P/A/G column for
.
Figure 2-4. Understanding the P/A/G Column Entries
Signal Names
Signal Functions
P/
A/
G
I/O
Type
Voltage
Pad
Type
St
During
Reset
PCSA[3]_
21
SIND_
GPIO[99]
—
DSPI_D Data Input
GPIO
—
A
G
—
I
I/O
VDDEH6
MH
– / Up
Primary functions
Secondary functions
GPIO functions are
No primary
footnote
Table
are listed first
are alternative functions
general functions listed last
function available
PCR Register
Bit
f
s
P/A/G
Symbol
PA Function Type
PA bit values
[0, 1, 2]
5
2
f
s
G
General-purpose I/O
0
0
0
P
Primary
0
0
1
4
3
f
s
A
Alternate
0
1
0
MP
Main
0
1
1
3
4
f
s
A2
Second alternate
1
0
0
All other values reserved for future use.
n
n
n
SIU_PCR register bits
3
4
5
The main function
is used for device
compatibility.
Содержание MPC5553
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