am using TDA8035 chip as interface between smart card reader and micro controller. for synchronous and asynchronous card with a external clock generated by a micro-controller.
IN datasheet, we could read the follow sentence: "It is mandatory when an external clock is used, that the clock is applied on XTAL1 before CMDVCCN falling edge"
For asynchronous mode, it's not a problem.
But for synchronous mode, it's a problem, because, if microcontroller send clock before CMDVCC falling edge, it will be not synchronized with card. (for example Microcontroller send 8 clocks, and card will receive 7 clocks (because card VCC is not yet active )
Have you any suggestion?