The ST7 forums are dedicated to ST7 microcontrollers. The ST7538 is not one of them, as you know. Anyway, There is more and more request concerning this product. I 'm happy you use this forum to discuss between you about this other ST product. But you should understand that you cannot get any help from standard ST7 users. I think and hope there is soon a dedicated space on ST website for such a product. Best regards Laurent