Electronic device comprising a memory accessible via a JTAG interface, and corresponding method of accessing a memory

An electronic device includes a processing unit with a memory, a JTAG interface with test-data-input and test­mode-select lines coupled to the processing unit, a bridge circuit, and a multiplexer circuit. The bridge circuit includes a serial communication interface receiving a serial data input signal which conveys an input serial data frame. The bridge circuit includes a serial-to-parallel converter circuit block receiving the input serial data frame, processing the input serial data frame to read first and second subsets of input binary values therefrom, and transmitting the first subset via a first output signal and the second subset via a second output signal. The multiplexer circuit selectively propagates a received test-data-input signal or the first output signal to the test data input line, and selectively propagates a test­mode-select signal or the second output signal to the test mode select line of the JTAG interface.