Microcontroller serial communication

Oct 1, 2014Download as pptx, pdf1 like533 views

This document discusses serial data transfer and the UART (Universal Asynchronous Receiver/Transmitter) interface. It describes the two main transmission modes - asynchronous and synchronous. It also discusses framing of data, the registers and signals used in serial communication like the SBUF register, and how to calculate the timer reload value needed for different baud rates depending on the crystal frequency and serial mode used.

transfer of data between two entities.
Classification:
-Parallel
-serial

Two basic transmission modes:
-Asynchronous: transmitter and receiver
clocks are independent.
-Synchronous: transmitter and receiver
modes are synchronized.

 Framing:
-Data word(octet) is encapsulated between
start bit
stop bit c
-receiver resynchronizes again at a start of each new word
or character received.

 Its an industry acronym which stands for
Universal Asynchronous Receiver
Transmitter.
 It is the interface circuitry between the
microprocessor and the serial port.
 It is responsible for breaking apart bytes of
data.
And transmitting it one bit at a time(i.e.
Serially)

It was designed by EIA(Electronics
Industries Association).
Voltage specifications:
-3V to -25V -- logic 1
+3V to +25V -- logic 2
Some specific signals

SBUF: Serial Buffer Register
-data moved to SBUF is transmitted
serially.
-serial data Rx-ed is stored by 8051 in
SBUF.
Example:
SBUF=‘char’;
variable=SBUF;
SFR: special function register

 This only applies to Serial Port modes 1 and 3.
 The Baud Rate is determined based on the
oscillators frequency when in mode 0 and 2.
 In mode 0, the baud rate is always the oscillator
frequency divided by 12.
 This means if your crystal is 11.059Mhz, mode 0
baud rate will always be 921,583 baud.
 In mode 2 the baud rate is always the oscillator
frequency divided by 64, so a 11.059Mhz crystal
speed will yield a baud rate of 172,797.

PC Baud rates
110
150
300
600
1200
2400
4800
9600
19200

 The basic equation for a timer reload value
can be stated as:
TH1 = 256 – Crystal Frequency/384 (or 192 if SMOD = 1)
Baud Rate
Example:
To obtain a timer reload value for a 9600 baud
serial data rate with an 11.0592 MHz crystal:
=256 – 11.0592/384
9600
= 256 – 3
= 253 or FD (hexadecimal)

The equation can also be solved to derive
the baud rate or the crystal frequency from
the other information as follows:
Baud Rate = Crystal Frequency/384 (or 192 if SMOD = 1)
256 – TH1

This document discusses serial communication using the 8051 microcontroller. It describes the basics of serial vs parallel communication and asynchronous vs synchronous serial communication. It then discusses the specifics of the 8051 serial port, including the use of a UART, duplex modes, start/stop bits, parity bits, and data transfer rates. It also covers the RS-232 standard for serial communication and how to interface the 8051 to RS-232 using a line driver chip like the MAX232.

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Total slides: 73 Universal Asynchronous Receiver Transmitter (UART) Introduction to Serial Communication Types of Transmission Simplex Communication Duplex Communication Half Duplex Communication Full Duplex Communication Methods of Serial data Transmission Synchronous serial data transfer Asynchronous serial data transfer Differences Synchronous Asynchronous Data Transfer Rate Calculation of Baud Rate SCON Register SBUF Register Writing to the Serial port Reading the Serial port PCON Register Programming of transmission byte serially Programming of reception of byte serially Examples

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Security is primary concern in our day-to-day life. Everyone wants to be as much as secure as possible. The UART (universal asynchronous receiver and transmitter) module provides asynchronous serial communication with external devices such as modems and other computers. The UART can be used to control the process of breaking parallel data from the PC down into serial data that can be transmitted and vice versa for receiving data. The UART allows the devices to communicate without the need to be synchronized. UART is a popular method of serial asynchronous communication. Typically, the UART is connected between a processor and a peripheral. To the processor, the UART appears as an 8-bit read-write parallel port that performs serial-to-parallel conversions for the processor, and vice versa for the peripheral. With the implementation of UART the serial communication is done in high data rate and no interrupts. Baud rate generator provides high data rate and interrupt controller handles all the interrupts. The UART serial communication interface device receives data and converts data from serial to parallel, where as the transmitter performs parallel to serial conversion.

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Serial communication can be parallel or serial. Serial communication is cheaper and supports longer distances but is slower. Data is packaged with start and stop bits in asynchronous transmission. The RS232 standard defines the voltage levels for logic 1 and 0. A MAX232 chip is needed to convert between TTL and RS232 levels. The 8051 has a serial buffer register (SBUF) and serial control register (SCON) for serial communication. It supports four modes of operation with different data formats and baud rates. The power control register (PCON) allows putting the 8051 into idle or power down modes to reduce power consumption.

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Microcontroller serial communication

2. transfer of data between two entities. Classification: -Parallel -serial

3. Serial versus parallel data transfer

5. Two basic transmission modes: -Asynchronous: transmitter and receiver clocks are independent. -Synchronous: transmitter and receiver modes are synchronized.

6.  Framing: -Data word(octet) is encapsulated between start bit stop bit c -receiver resynchronizes again at a start of each new word or character received.

8.  Its an industry acronym which stands for Universal Asynchronous Receiver Transmitter.  It is the interface circuitry between the microprocessor and the serial port.  It is responsible for breaking apart bytes of data. And transmitting it one bit at a time(i.e. Serially)

9. It was designed by EIA(Electronics Industries Association). Voltage specifications: -3V to -25V -- logic 1 +3V to +25V -- logic 2 Some specific signals

11. SBUF: Serial Buffer Register -data moved to SBUF is transmitted serially. -serial data Rx-ed is stored by 8051 in SBUF. Example: SBUF=‘char’; variable=SBUF; SFR: special function register

16.  This only applies to Serial Port modes 1 and 3.  The Baud Rate is determined based on the oscillators frequency when in mode 0 and 2.  In mode 0, the baud rate is always the oscillator frequency divided by 12.  This means if your crystal is 11.059Mhz, mode 0 baud rate will always be 921,583 baud.  In mode 2 the baud rate is always the oscillator frequency divided by 64, so a 11.059Mhz crystal speed will yield a baud rate of 172,797.

17. PC Baud rates 110 150 300 600 1200 2400 4800 9600 19200

18.  The basic equation for a timer reload value can be stated as: TH1 = 256 – Crystal Frequency/384 (or 192 if SMOD = 1) Baud Rate Example: To obtain a timer reload value for a 9600 baud serial data rate with an 11.0592 MHz crystal: =256 – 11.0592/384 9600 = 256 – 3 = 253 or FD (hexadecimal)

19. The equation can also be solved to derive the baud rate or the crystal frequency from the other information as follows: Baud Rate = Crystal Frequency/384 (or 192 if SMOD = 1) 256 – TH1

Microcontroller serial communication

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Microcontroller serial communication