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There are no problems for the product with TEST1_N pin if a pull up resistor and capacitance are connected to the RESET_N pin. However, the product without the TEST1_N pin uses the RESET_N pin as the communication pin to the on-chip debug emulator (uEASE) and flash writer; therefore, communication may not be possible if a pull up in 1 kΩ or less resistance value and a capacitance with several 10 nF are connected.