Datasheet

Signal Description
2-18 MCF5206e USER’S MANUAL MOTOROLA
2.14.4 Break Point (TMS/BKPT)
The MTMOD signal determines the function of this dual-purpose pin. If MTMOD = 0, then
the TMS function is selected. If MTMOD =1, the BKPT function is selected. MTMOD
should not change while RSTI = 1.
The assertion of the active-low BKPT input signal causes a hardware breakpoint to occur
in the processor when in the Debug mode. See Section 15: Debug Support section for
additional information on this signal.
2.14.5 Development Serial Input (TDI/DSI)
The MTMOD signal determines the function of this dual-purpose pin. If MTMOD = 0, then
TDI is selected. If MTMOD = 1, then DSI is selected. MTMOD should not change while
RSTI = 1.
The DSI input signal is the serial data input for the Debug module commands. See
Section 15: Debug Support section for additional information on this signal.
2.14.6 Development Serial Output (TDO/DSO)
The MTMOD signal determines the function of this dual-purpose pin. When MTMOD = 0,
TDO is selected. When MTMOD = 1, then DSO is selected. MTMOD should not change
while RSTI = 1.
The DSO output signal is the serial data output for the Debug module responses. See
Section 15: Debug Support section for additional information on this signal.
2.15 JTAG SIGNALS
2.15.1 Test Clock (TCK)
TCK is the dedicated JTAG test logic clock that is independent of the MCF5206e
processor clock. The internal JTAG controller logic is designed such that holding TCK
high or low for an indefinite period of time will not cause the JTAG test logic to lose state
information. TCK should be grounded if it is not used.
2.15.2 Test Reset (TRST/DSCLK)
The MTMOD signal determines the function of this dual-purpose pin. If MTMOD= 0, the
TRST function is selected. If MTMOD=1, the DSCLK function is selected. MTMOD should
not be changed while RSTI
= 1.
The assertion of the active-low TRST
input pin asynchronously resets the JTAG TAP
controller to the test logic reset state, causing the JTAG instruction register to choose the
‘‘bypass’’ command. When this occurs, all the JTAG logic is benign and does not interfere
with the normal functionality of the MCF5206e processor. Although this signal is
asynchronous, we recommend that TRST make only a 0 to 1 (asserted to negated)
transition while TMS is held at a logic 1 value. TRST
has an internal pullup so that if it is
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