Week 4 FYP II

Title of activity:

Universal Asynchronous Receiver/Transmitter ( UART Part C )


Objectives:

To get a better understanding on UART which was the connector between PIC to computer


Content/Procedure: 

UART

A Universal Asynchronous Receiver/Transmitter, abbreviated UART, is a type of  "asynchronous receiver/transmitter", a piece of computer hardware that translates data between parallel and serial forms. UARTs are commonly used in conjunction with communication standards such as EIA, RS-232, RS-422 or RS-485. The universal designation indicates that the data format and transmission speeds are configurable and that the actual electric signaling levels and methods (such as differential signalling etc.) typically are handled by a special driver circuit external to the UART.

So, in my project, I would propose to use RS-232. Below is more detail on RS-232.

The MAX232 is an integrated circuit, first created by Maxim Integrated Product, that converts signals from an RS-232 serial port to signals suitable for use in  TTL compatible digital logic circuits. The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals.

The drivers provide RS-232 voltage level outputs (approx. ± 7.5 V) from a single + 5 V supply via on-chip charge pump and external capacitors. This makes it useful for implementing RS-232 in devices that otherwise do not need any voltages outside the 0 V to + 5 V range, as power supply design does not need to be made more complicated just for driving the RS-232 in this case.

The receivers reduce RS-232 inputs (which may be as high as ± 25 V), to standard 5 V TTL levels. These receivers have a typical threshold of 1.3 V, and a typical hysteresis of 0.5 V.

Interfacing Devices to RS-232 Ports

RS-232 communication is asynchronous. That is a clock signal is not sent with the data. Each word is synchronized using its start bit, and an internal clock on each side, keeps tabs on the timing. 

Conclusion:

Since we already go through all the component in Part C, we can say that Part C is the connector which to connect from the PIC to computer.