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

If you are confident you will not make programming errors, they won't be needed. Since everyone does on occasion, you may want to incorporate them as an additional safty measure. If you are connecting more than two SXs to the same line, each should have a smaller resistor (say around 110?) to protect all possible combinations of IO error. Though the standard method of connecting multiple devices together is using an open collector configuration. This is done in an SX by switching between an output whose value is always 0 and input (High-Z), and each line is pulled up to Vdd through a resistor. In this configuration, there is never a situation where the line is driven an active high (it is left alone (input), or it is pulled down (output of 0)), since there is never a situation where an output high and an output low happen at the same time, there is no chance of an IO error.

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