I know that the levels are not exactly by the book, the input low level for Pic microcontrollers is guaranteed at 0.15 VDD for CMOS inputs. You can skip the diode if the microcontroller has internal protection diode. also the resistor is not required if the slave has a pull up. If the Tx output is open colector you can connect together TX RX and data line without the diode.
The resistor can be in 1Kohm to 10Kohm range. Simple 5V microcontroller interfaceĪ normal switching diode can be used but the noise margin could be to low.
#Cctalk Serial Interface Pc
Some dedicated gaming PC based platforms like this one have one or more built in ccTalk ports. This allows a low cost interface width 5V microcontrollers. The logic levels for the ccTalk line are 3.5 to 5V for mark state (idle ) and 0 to 1V for space state (active).
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