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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
17-5
17.2
External Signal Description
17.2.1
Overview
Each unified channel has one input and one output signal connected to the channel’s I/O pin. Refer to the
SIU, eTPU, and DSPI sections for details about the connection to pads and other modules.
NOTE
On channels 12-15, input can be from DSPI, but cannot be from
eMIOS[12:15] because these are not pinned out. See
The internal
output disable input
) are provided to implement the output
disable feature needed for motor control. They are connected to EMIOS_Flag_Out signals according to
Section 17.2.1.2, “Output Disable Input—eMIOS Output Disable Input Signals
17.2.1.1
External Signals
When configured as an input, EMIOS
n
is synchronized and filtered by the programmable input filter (PIF).
The output of the PIF is then used by the channel logic and is available to be read by the MCU through the
UCIN bit of the EMIOS_CSR
n
. When configured as an output, EMIOS
n
is a registered output and is
available for reading by the MCU through the UCOUT bit of the EMIOS_CSR
n
.
Table 17-2. External Signals
Signal
Direction
Function
Reset State
EMIOS[0:11, 16:23]
Input
eMIOS Unified Channel n input
—
EMIOS[12:15]
Input
From DSPI
—
EMIOS[0:23]
Output
eMIOS Unified Channel n output
0 / Hi-Z
1
1
A value of 0 refers to the reset value of the signal. Hi-Z refers to the state of the external pin if a tri-state
output buffer is controlled by the corresponding eMIOS signal.
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