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Это раз.
Reading the Die ID register will give incorrect results if the TCK (JTAG) pin is not held high.
А это - два
The System Register (SYSR) cannot be read or written without JTAG clock. SYSR does notcontrol CLOCKOUT divisor when a JTAG connection to the debugger is not present. Writes to this register without JTAG fail to divide down clock out.
И чё? Хочу ID считать - тормози клок. Хочу клок поделить - запускай JTAG.
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