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— Device identification register
•
A TAP controller state machine that controls the operation of the data registers, instruction register
and associated circuitry
•
Censorship Inhibit Register
— 64-bit Censorship password register
— If the external tool writes a 64-bit password that matches the Serial Boot password stored in the
internal flash shadow row, Censorship is disabled until the next system reset.
1.4.28
Development Trigger Semaphore (DTS)
MPC5644A devices include a system development feature, the Development Trigger Semaphore (DTS)
module, that enables software to signal an external tool by driving a persistent (affected only by reset or
an external tool) signal on an external device pin. There is a variety of ways this module can be used,
including as a component of an external real-time data acquisition system.
Freescale Semiconductor
MPC5644A Microcontroller Reference Manual, Rev. 6
Introduction
51
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