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

Steel,

it's a good habit, not to leave any inputs open and floating. As the RTCC input is rarely used, connect it to Vdd via a pull-up resistor (4.7 to 10 kOhm is fine). The same is true for any un-used I/O port pins. You may either configure them as outputs, or as inputs with the internal pull-up resistors activated.

Always place a bypass capacitor (100 nF, ceramic) between Vdd and Vss as close as possible to the chip's supply pins in order to reduce EMI. Also make sure that the traces for the OSC1 and OSC2 signals are as short as possible.

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