Hi Glenn,

seems, you want to connect the SJA1000 ?

Then /CS can be hold permanently low.

Also address and data can be loaded directly into P1 and there is no need to use R0/R1 at first.

And anytime before /RD was pulled low, P1 must be loaded with 0FFh to deactivate the strong low level output stages.


There exist also a CAN controller from Microchip with SPI interface.


Peter