To have the serial port S0 free for the application, I want to use the simulated serial mode. The UART ASC0 mode works correctly (burned to external FlashROM), but not the simulated serial mode (seems to have no connection). The controller does not answer to the PC (checked with an oscilloscope). I'm using P8.6 and P8.7 as data lines (changed in inst167.a66) and a RS232 transceiver. BAUDRATE is 9600, CPU_CLOCK is 19660800. What could be wrong?