
Data is shifted between TDI and TDO though the selected register starting with the least
significant bit, as illustrated in the following figure. This applies for the instruction
register, test data registers, and the bypass register.
Selected Register
LSB
MSB
TDI
TDO
Figure 33-3. Shifting data through a register
33.4.3 TAP controller state machine
The TAP controller is a synchronous state machine that interprets the sequence of logical
values on the TMS pin. The following figure shows the machine's states. The value
shown next to each state is the value of the TMS signal sampled on the rising edge of the
TCK signal. As the following figure shows, holding TMS at logic 1 while clocking TCK
through a sufficient number of rising edges also causes the state machine to enter the
Test-Logic-Reset state.
Chapter 33 JTAG Controller (JTAGC)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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Summary of Contents for KE1xF Series
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