TxD is the serial UART data output of a controller connected to RxD at SI in 8051, or UART Intel 8250, or UART 16550, which includes a 16-byte buffer. ... The code also takes into account the meaning of multiple keys when they are simultaneously pressed. ... Figure 2.15(c) shows an interface to an external D/A. The external D/A is used as an alternative when PWM is not used. ... An external ( ADC), for example, ADC0808, can also be used with interfacing similar to that of the ports.
|Title||:||Embedded Systems 2E|
|Publisher||:||Tata McGraw-Hill Education - 2008|