In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

It is not only the bypass caps - I also highly recommend to connect all four Vdd pins to Vdd, and all four Vss pins to Vss in order to reduce the impedance of the supply traces to recude EMI. This also has the advantage that you can sink into or source from outputs the maximum allowed total current (see the data sheet for more details under "Absolute Maximum Ratings").

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