8251 programmable communication interface chip

Applications of 8251 programmable communication interface chip.
Ans.:
8251 is programmable communication interface. Which is used as Universal Asynchronous Receiver Transmitter. (UART 8251), which is modeled on the peripheral interface device adapter.
     It consists:

1. a serial transmit block.
2. a serial receive block.
3. a CPU interface (I/f) block
4. 8251 is used as program control device.