Questions tagged [baudrate]

Often misused term, when "bit-rate" is meant.

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PIC18F4550 Asynchronous USART Baud Rate

I am trying to implement a USART routine to transmit a string using PIC18F4550. I intend to transmit the message at 115200 baud rate in asynchronous mode. My PIC18F4550 is running at 48MHz using 20MHz ...
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0 answers
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CAN bus wrong bit rate calculation - stm32f107 keil drivers

I am using keil drivers to use CAN bus on an STM22F107. The method below is used to set CAN baud rate. ...
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How Ethernet uses full bandwidth of the link if one host is sending more than one frame for different hosts? [closed]

I followed from this question. We know that modern Ethernet is full-duplex. At the same time, we can send or receive the signal. Suppose I consider one LAN where multiple hosts are connected by ...
0 votes
1 answer
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Baseband uses full bandwidth of the entire link or portion of the bandwidth?

We know that modern Ethernet is full-duplex. At the same time we can send Or receive the signal. Suppose I consider one Lan where multiple hosts are connected by different ports of switch. Let's take ...
3 votes
1 answer
216 views

ADXL345 Accelerometer data rate vs bandwidth

I recently started working with the ADXL345 Accelerometer and got a bit confused on what's the difference between the data rate and bandwidth. From the ADXL345 datasheet p14, we can see the different ...
-2 votes
2 answers
334 views

Why baseband uses full bandwidth of the signal where broadband uses portion of the bandwidth? [closed]

We know that broadband signal is full-duplex, for example television cable line where all TV channel is used portion of bandwidth not full bandwidth. And modern baseband is also full duplex but all ...
-2 votes
2 answers
2k views

UART: How to calculate bit time?

Reading this application note about timing for enable RS485 transeiver, I read that I need to ensure a time called "bit time", which depends on the baud rate, for example the document shows ...
1 vote
1 answer
85 views

Where did I go wrong with picking my baud rates?

So I have an xbee (API mode, series 2) communicating with either a naked 328p on a breadboad (8 MHz external oscilator) or an adafruit pro trinket (328p based, 12 MHz external oscilator). Though never ...
1 vote
0 answers
213 views

How can I access my microcontroller's clock frequency and make it work at 16 MHz?

I wrote a USART communication code in bare metal mode (On STM32F107). And what I wrote in the "Baud rate" section( to select the baud rate): ...
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2 answers
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Why would you right shift 8 bits for 8 bit register?

MCU: Atemega328P Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf (Page 143 - USART) Note: I am beginner :) Using the BAUD ...
-1 votes
1 answer
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MCP2515 CAN Transceivers can't go higher than 125kbps

So firstly, you'll have to excuse my lack of electronic knowledge and popper terminology, this is my first crack at anything outside of the software world. I have 2 MCP2515 CAN Transceivers (the cheap ...
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MSP430 UART Reading

I'm trying to transmit and receive data between Arduino Uno and CC430. There is no problem with sending data from CC430 to Arduino Uno. I can receive the data on Arduino side. Also I can transmit the ...
0 votes
1 answer
234 views

2 devices with different CAN baud

I have a project where I need to talk with 2 devices x & y with 125kbps and 500kbps CAN speeds respectively. So I selected an MCU (F446RC) with 2 CAN controllers from ST. The BOM cost went up and ...
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1 answer
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MSP430FR2433 SPI data corrupted

I'm currently working with MSP430FR2433 Micro. I want to interface this micro with the following modules: LCD screen via SPI (https://www.orientdisplay.com/store/amc0802br-b-y6wfdy-spi-8x2-character-...
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Bit error rate calculation for LIN protocol

I am having this microcontroller - S32K142 64 Pin 5V Core voltage Microcontroller Reference Manual I am using an 8MHz external clock. I want to calculate the Bit error rate of my LIN Communication. My ...
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3 answers
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Ambiguity about concept of baud rate and bit rate

I know that there is lots of questions and answers that is related to this topic, but i can not clearly and distinctively find answers to my questions, yet. In addition i found some answers which ...
1 vote
1 answer
189 views

what is the meaning of BLE data rate 1Mbps?

I am using BLE HM10 module which is BLE 4.0 1Mbps assume I have 1000000 data bits to send within a second, so I need 1Mbps bandwidth, Is 1Mbps only for Data bits? or 1Mbps means complete ...
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1 vote
2 answers
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What is the meaning of Angular Velocity Vector 100Hz of BNO055?

I am using an Arduino Nano with BNO055 Adafruit library. The I2C speed is 400 kHz. The Adafruit BNO055 Absolute Orientation Sensor mentions Angular Velocity Vector (100 Hz). What does this 100 Hz ...
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1 answer
231 views

How does i2c standard or fast mode effect the output data rate of the sensor?

I am using BNO055 motion sensor supports standard mode 100kHz and fast mode 400kHz but sensor specifies following Gravity Vector 100Hz Euler Vector, 100Hz Quaternion, 100Hz Magnetic Field ...
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2 answers
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Is there hardware compatibility between CAN 2.0 High Speed, Low Speed and CAN-FD?

I am studying CAN interface hardware for the design of an automotive scanner. So far, I have identified the following types of CAN: CAN 2.0 High-Speed: bit rate up to 1Mbps CAN 2.0 Low Speed: bit ...
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Can you use a CAN FD transceiver for low speed (fault tolerant) CAN?

Fault tolerant CAN (ISO11898-3) is terminated differently than high speed CAN (ISO11898-2). Therefore the signal levels for dominant and especially recessive bits differ. Newer CAN FD compatible ...
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2 answers
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ATSAMC21 - CAN configuration - Nominal bit timing vs. data bit timing & time quanta calculation

I'm trying to configure the CAN bit rate of an ATSAMC21 to 125ksps in a CAN2.0B configuration. However, after reading through the datasheet, the ASF documentation and the ATMEL start help I'm confused....
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3 answers
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How to demonstrate the effect of baudrate in serial communication

Regarding baudrate in serial communication, the only requirement is that both devices operate at the same rate. The common baud rates are 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 ect. ...
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How can I possibly get a 9600Hz square wave, for a serial baud rate?

I'm trying to create parallel to RS-232 serial converter using standard logic (serial transmitter only, no serial receive functionality). To get the clock signal my idea was to get a 7.3728MHz ...
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1 answer
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Atmega328 ubrr value shifting issue for serial transmission

My doubt is about the way in which the baudrate value is written into UBRRn registers. For eg: Lets say i want to write the value 25 into UBBRn registers to configure the microcontroller to ...
-3 votes
3 answers
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Baud Rate Generator [closed]

I came across a block called Baud rate generator when reading about the TIVA UART module. I also came across the below formula for calculating the Baud rate divisor, Baud Rate Divisor = UARTSysClk/ ...
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1 answer
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Transmission of serial data characters

On a serial data link characters are transmitted data rate of 9600 baud. if characters are 8 bits and there is one start bit and one stop bit per character, then what is the number of characters ...
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How can I estimate the minimum baudrate for a given bitrate?

My circuit performs data acquisition at 250 samples/s, 24 bits/sample and transmit this information to the local host (PC) through a bluetooth module that implements the UART protocol. As far as I ...
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1 answer
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Transmission distance rs485 vs ethernet

I have a question, why is rs485 limited to less than 100 meters at 10mpbs ( mbaud ) and is 100Base-TX ethernet applicable on 100 meters with 100 mbps bitrate i know that rs485 normally use a sort ...
1 vote
1 answer
442 views

How does Nyquist bit rate formula relate Bandwidth, Signal Rate, and Bit Rate?

I know what each of Bandwidth, Signal rate, and Bit rate mean. But I am having trouble in their mathematical relationship with each other. I will use the notation of the textbook I am reading from (...
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Baud rate for Square Wave data signal via UART if frequency is given

I was trying to solve the 2013 paper set by ISRO for electrical engineers. Question no 13 made me confused. So since Idle in UART is usually high and start bit is low, we can find the 8 bit data ...
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MSP430 Baud Rate Generation: Datasheet Discrepancy

My project is based around the MSP430F5529. From the MSP430x5xx family user guide: NOTE: Baud-rate settings quick set up To calculate the correct the correct settings for the baud-rate ...
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1 vote
1 answer
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MSP430 USB Module and Baud Rate Detection

I am working on a project which uses the USB module integrated into the MSP430F5529, specifically using the MSP-EXP430F5529LP development board from TI. I am using the USB API provided in MSPWare. ...
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2 votes
1 answer
300 views

UART stop bit baud timing error

On PIC micro controller UART, Baud rate was set to 38400 (No parity,, 8 data bits), ...
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1 vote
1 answer
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Why is the signal rate separated into three case?

The definition of signal rate is number of signal elements (timewise shortest unit) sent in 1s. The book says that the signal rate of all 1s or all 0s may be different from a data pattern of ...
-3 votes
1 answer
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Bandwidth (Data rate) of a laser beam when no datasheet exists for the module

I ordered a large number of laser modules that look like the following: When inspecting mine with a basic multimeter, I noticed a 90 ohm smd resistor is fitted on the module. I see no other ...
3 votes
2 answers
4k views

Max SPI data rate supported

This is probably relevant for all SPI compatible chips but I'm asking for the DRV8711 in particular. The data sheet lists the SPI timing requirements and I was wondering how to get the maximum data ...
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1 vote
1 answer
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Communication between different Baud rates [closed]

I am totally new to just about all of this, first off. I have two boards that I want to be able to communicate. Both are using half-duplex serial connection, but one is fixed at 4800bps, and the ...
0 votes
2 answers
1k views

Efficient size of FIFO buffer for UART

I am designing a software for a microcontroller that transmits and receive data from various UARTs in a loop every 15ms. I am using UART interrupts to send and receive data. UART interrupt copy bytes ...
8 votes
1 answer
363 views

Unexpected Atmega16 response over UART

Unexpected Atmega16 response over UART Brief problem summary I have flashed an Atmega16 with code that should result in the Atmega16 sending back whatever character I send to it via a terminal. I ...
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0 answers
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Baudrate in a STM32L152 Discovery

I have the following code: ...
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USART baudrate in STM32L152

I am trying to figure out how to configure the USART of the mentioned discovery board for a transmission of 14400,8,N,1. My problem is that I don't know what to put in the USARTx\$\rightarrow\$BRR ...
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Baudrate calculation

I am having a hard time to calculate the baud rate for the following: Needed baud rate for 2 bytes data at 1KHz over an UART port with a 8N1 protocol Thanks
1 vote
2 answers
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Time for serial data(UART) transmission

Dear all i have a very simple question on serial data transmission. signed int NUM;//32 bit NUM=235; the serial configuration is: 115200 baud rate 1 start 1 ...
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1 answer
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Absolute minimum delay required to process data across shift registers

In an effort to make my serial data processing faster, I attempted to use serial mode 0 with a system clock speed of about 3.686Mhz. Its clock comes from the ALE output of an unprogrammed at89S52 that ...
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8 votes
2 answers
2k views

Does a baudrate in serial communication (USB or RS232) need to be exact?

In serial communication, does the baudrate mean we have to use the exact clock speed or is it a range of speeds that we can use? and if it's an exact value, how exact should it be ? for example, can ...
1 vote
1 answer
798 views

UART devices: Baud rates different by a factor

I have UART devices where I can chose various non-standard speeds, but none of them are matching. There are however some speeds, that are a multiple of the other device's speeds. For instance, I could ...
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UART - the clock frequency of the uart transmiter iis different from uart receiver

I use UART between two system (which have 2 proccesors). The uart of transmiter has clock frequency off 100MHz. and the uart of the receiver has a clock of 125MHz. The baud rate I use is 1e6. I can ...
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How does 16550 UART handle non-integer baud rates? [closed]

The 16550 UART calculates the baud rate using formula 115200 divided by the 16-bit number obtained by concatinating the High and Low DL registers. There are several well-known divisors that get you ...
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Baud to bit mapping for the UART?

Before starting the question, a reminder of the difference between on how a baud rate and a bit rate relate. Two people are standing 1km apart and they want to exchange a 8 bits of data. ...