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Restrictions
23.2.1
Non-Scan Chain Operation
In non-scan chain operation, there are two constraints. First, the TCK input does not include
an internal pull-up resistor and should not be left unconnected to preclude mid-level inputs.
The second constraint is to ensure that the scan chain test logic is kept transparent to the
system logic by forcing TAP into the test-logic-reset controller state, using either of two
methods. Connecting pin JCOMP to logic 0 (or one of the reset pins), or TMS must be
sampled as a logic one for five consecutive TCK rising edges. If then TMS either remains
unconnected or is connected to V
, then the TAP controller cannot leave the
DD
test-logic-reset state, regardless of the state of TCK.
23.2.2
BSDL Description
The BSDL file for the can be found on the Motorola web site.
23-8
MPC533 Reference Manual
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
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