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

What is going to control the 4066 ? 

The "legacy device" ?

The SX48 could probably handle the switching (instead of using the 4066 & 74HC14). 

You could either receive and re-send to the other device, or use the comparitor to enable/disable the serial stream reaching the other device.

Bean.

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