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o man is an island, and neither is a microcontroller application. Except for those that are completely self-contained in a single chip microcontroller, your microcontroller-based application will need to communicate with an external device, be it an additional peripheral device, a host PC, or another microcontroller-based application. Figure 7.1 illustrates the idea. In the simplest of cases, the AVR device communicates to a peripheral device such as a memory device, or a digital port or an ADC. These devices may be part of a single application. In another case, your AVR device may want to communicate with a host PC for transferring data, while in another case, it may want to communicate to multiple devices all interconnected to each other using a bus configuration. The communication between an AVR and an external device or devices is essentially of two types: point-to-point communication or a bus-based communication. A point-to-point communication connects two devices, while a bus offers multiple devices to share the same physical connection lines. Whether to go for a point-to-point communication or a bus-based communication is solely determined by need. Bus-based communication seems attractive, as a single communication link allows multiple devices to communicate, but this scheme is not without complexities for example to regulate communication traffic on the shared lines.
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PC AVR or I/O device
PC AVR AVR or I/O device
PC or I/O device
FIGURE 7.1 Communication link for AVR processor. The figure illustrates the processor in a point-to-point communication link to another device as well as a link with a bus configuration with multiple devices connected onto the bus.
While as a designer you are free to design your own communication protocol, both at a hardware and software level, it is best to consider one of the many standard communication schemes. The added advantage is that the AVR has many of these schemes available as on-chip peripherals.
7.2 RS-232 Link
RS-232 communication is by far the most common communicating mode that the AVR can utilize. RS-232 is an asynchronous serial transfer mechanism. This bit-serial transmission method can be split up in two parts: the way the original byte data is split up serially for transmission and the way this serial data is physically transmitted over wires. The way the data is split serially is not unique to RS-232. Other protocols like RS-422, RS-423, and RS-485 also use this method. These asynchronous serial methods differ in the way the serial data is transmitted over the physical wires. Figure 7.2 shows how the original data is reorganized with a start bit added at the beginning of the data transmission and at the end, an optional parity bit, and up to two stop bits. Also, the order of bit transmission is LSB of the data byte first and MSB of the data byte last. Once the data to be transmitted is lined up as in Figure 7.2, it is time to consider how is it physically transmitted over wires, what the voltage levels are, and what the duration of each transmission is. The transmitter and receiver of data use a fixed data rate, called the bit rate. Most common bit rates are 300, 600, 1200, 1800, 2000, 2400, 4800, 9600, and 19200 bits per second. Bit rate is the time for which one bit (out of the 10 or so bits) is available at the output (or input). The bit data to be transmitted is converted to RS-232 standard voltage level before putting it on the wires. The legal voltage limits are illustrated in Figure 7.3.
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