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Which of the following works by using a serial port?

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Which of the following works by using a serial port?

(a) Simulator

(b) JTAG

(c) BDM

(d) OnCE

This question was posed to me in semester exam.

The origin of the question is Emulation Techniques topic in portion Emulation and Debugging Techniques of Embedded Systems

1 Answer

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Correct answer is (b) JTAG

The explanation: The JTAG works by using a serial port and clocking data into a shift register and the output of the shift register drives the pins under the control of the port.

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