RIO and the CLK pin

Rabbit
1

I am starting to work with the RIO peripheral and it says that the CLK output from the Rabbit 4000 uP is a good input for the RIO’s CLK input. However, I am using a rabbitCore 4010, and I dont see mention of any CLK output on the main pinout. Is there a way to make the RIO work off the rabbitCore’s clock? Thanks.

2

The answer from Rabbit:

The RIO will need a dedicated clock line which we don’t provide off the Rabbit.

You can fake a clock line using a serial port pin but your top speed for the RIO clock will be:

    RIO CLK = (Rabbit CPU)/2n

Where n represents an integer greater than zero.

You can find a schematic for the suggested clock circuit on the RIO’s page under their schematic download.