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

Peter,

although I also don't have a good explanation for the SYNC function, I don't think that it has something to do with the "campatibility mode" as the SX48/52 also have that SYNC feature on one hand but don't have that "compatibility" mode on the other.

The explanation in the SX48/52 data sheet is a "bit" more detailled that in the SX28 data sheet. It reads:

"Synchronous input enable (this bit synchronizes the signal presented at the input pins to the internal clock through two internal flip-flops). Required to be enabled unless the transition on the input pin is not close to the clock edge. If enabled, port data must be read more than 2 cycles after a change to the input level mode or Schmitt Trigger mode (see Figure 3-2). SYNC is always enabled on RTCC."

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