MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
25-5
asynchronously holding all other Nexus modules in reset as well. This prevents Nexus read/write to
memory mapped resources and the transmission of Nexus trace messages. Refer to
for
information on Nexus port enabling and disabling regarding censorship.
25.2
External Signal Description
The auxiliary and JTAG pin interfaces provide for the transmission of messages from Nexus modules to
the external development tools and for access to Nexus client registers. The auxiliary/JTAG pin definitions
are outlined in
25.2.1
Detailed Signal Descriptions
This section describes each of the signals listed in
in more detail.
25.2.1.1
Event Out (EVTO)
EVTO is an output pin that is asserted upon breakpoint occurrence to provide breakpoint status indication
or to signify that an event has occurred. The EVTO output of the NPC is generated based on the values of
the individual EVTO signals from all Nexus modules that implement the signal.
25.2.1.2
Event In (EVTI)
EVTI is used to initiate program and data trace synchronization messages or to generate a breakpoint.
EVTI is edge-sensitive for synchronization and breakpoint generation.
Table 25-1. Signal Properties
Name
Port
Function
Reset State
EVTO
Auxiliary
Event Out pin
Negated
EVTI
Auxiliary
Event In pin
Pulled Up
MCKO
Auxiliary
Message Clock Out pin (from NPC)
Enabled
MDO[3:0] or
MDO[11:0]
Auxiliary
Message Data Out pins
Driven Low
1
1
Following a power-on reset, MDO0 remains asserted until power-on reset is exited and the system
clock achieves lock.
MSEO[1:0]
Auxiliary
Message Start/End Out pins
Negated
RDY
Auxiliary
Ready Out pin
Negated
JCOMP
JTAG
JTAG Compliancy and TAP Sharing Control
Pulled Down
TCK
JTAG
Test Clock Input
Pulled Down
TDI
JTAG
Test Data Input
Pulled Up
TDO
JTAG
Test Data Output
Pulled Up
TMS
JTAG
Test Mode Select Input
Pulled Up
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