Non-Ieee 1149.1 Operation - Motorola MC68306 User Manual

Also, the MC68306 contains dynamic logic, so EXTAL must be driven by a free-running
clock at all times.

7.6 NON-IEEE 1149.1 OPERATION

In non-IEEE 1149.1 operation, the IEEE 1149.1 test logic must be kept transparent to the
system logic by forcing the TAP controller into the test-logic-reset state. This requires
either:
1. An active (low) signal applied to TRST .
2. A minimum of five consecutive TCK rising edges withh TMS high. TMS has an
internal pullup, and may be left unconnected.
If TMS either remains unconnected or is connected to V CC , then the TAP controller
cannot leave the test-logic-reset state, regardless of the state of TCK or TRST.
7-12 MC68306 USER'S MANUAL MOTOROLA