MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
2-43
The MPC5553 has a primary signal function of CAL_ADDR[11]. The alternate signal function
FEC_MDIO provides a fast Ethernet data management I/O to manage the data output. The second alternate
signal function CAL_CS[3] provides a calibration chip select function. The FEC function FEC_MDIO and
the calibration function CAL_CS[3] are not available on the MPC5554. This pin can also be used as a
GPIO signal.
2.3.3.11
External Bus Busy / GPIO - MPC5554 Only
BB_GPIO[74]
BB_GPIO[74] has a primary function of BB that indicates the external bus interface (EBI) is busy. The
BB_GPIO[74] signal function is not available on the MPC5553. This pin can be used as a GPIO signal for
the MPC5554 only.
2.3.4
Nexus Signals
2.3.4.1
Nexus Event In
EVTI
EVTI is an input that is read during a debug port reset to enable or disable the Nexus Auxiliary port (for
trace). After reset, the EVTI pin is used to initiate program and data trace synchronization messages or
generate a breakpoint.
2.3.4.2
Nexus Event Out
EVTO
EVTO is an output that provides timing to a development tool for a single watchpoint or breakpoint
occurrence.
2.3.4.3
Nexus Message Clock Out
MCKO
MCKO is a free running clock output to the development tools which is used for timing of the MDO and
MSEO signals.
2.3.4.4
Nexus Message Data Out
MDO[3:0]
MDO[3:0] are the trace message outputs to the development tools.
In addition to being a trace output, MDO[0] indicates the lock status of the system clock following a
power-on reset. MDO[0] is driven high following a power-on reset until the system clock achieves lock,
at which time it is then negated. There is an internal pullup on MDO[0].
2.3.4.5
Nexus Message Data Out / GPIO
MDO[11:4]_GPIO[82:75]
MDO[11:4]_GPIO[82:75] are the trace message outputs to the development tools for full port mode. These
pins function as GPIO when the Nexus port controller (NPC) operates in reduced port mode.
Summary of Contents for MPC5553
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