Problems working with timers and serial ports simultaneously

I required the usage of serial port 1 on a Dallas 89C420. In order to use it i checked the example program Interrupt-Driven Serial I/O Support for printf filename "intsio.zip". The example was adapted...
Problems working with timers and serial ports simultaneously

I required the usage of serial port 1 on a Dallas 89C420. In order to use it i checked the example program Interrupt-Driven Serial I/O Support for printf filename "intsio.zip". The example was adapted...
make com0 and com1(serial ports)of mcb2140 work simultaneously

Hi, I have mcb2140 which two serial ports COM1 and COM0. I want to connect COM1 to my computer and COM0 to other evaluation board PN544. I want to basically send commands from my computer to...
make com0 and com1(serial ports)of mcb2140 work simultaneously

Hi, I have mcb2140 which two serial ports COM1 and COM0. I want to connect COM1 to my computer and COM0 to other evaluation board PN544. I want to basically send commands from my computer to...
Can We use Port and its alternate functions simultaneously

I use one of the derivative of 8051 ie At89s8252. Here i want to switch the port function for example Enable Spi use spi port .... .... .... disable spi use port (same port of spi) enable...