Im usint AT89S8252. Has anybody a .C routine to get a second serial interface using port 1, I mean, how can I setup P1.1 to TXD and P1.0 to RXD. I need use two serial interfaces together, I mean, actually I,m using P3 but i need one more. Sorry for my english.
Maxim makes a SPI UART (MAX3100) if that helps. You'll need four I/O's instead of 2 though.