NXP Semiconductors MPC5566 - Mdo[0]

Signal Description
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 2-25
2.3.3.4 Nexus Message Data Out
MDO[0]
MDO[0] is a trace message output to the development tools. In addition, 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].
2.3.3.5 Nexus Message Data Out
MDO[3:1]
MDO[3:1] are the trace message outputs to the development tools.
2.3.3.6 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.
2.3.3.7 Nexus Message Start / End Out
MSEO
[1:0]
MSEO[1:0] are output signals that indicate when messages start and end on the MDO pins.
2.3.3.8 Nexus Ready Output
RDY
RDY is an output signal that indicates to the development tools the data is ready to be read from or written
to the Nexus read/write access registers.
2.3.4 JTAG Signals
2.3.4.1 JTAG Test Clock Input
TCK
TCK provides the clock input for the on-chip test logic.
2.3.4.2 JTAG Test Data Input
TDI
TDI provides the serial test instruction and data input for the on-chip test logic.
2.3.4.3 JTAG Test Data Output
TDO
TDO provides the serial test data output for the on-chip test logic.