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It cannot be 1 to 1 because, 115200 bits per seconds is 14.0625 KBps (kilo byte per second), which is too slow. A UART simply encodes 1 as a high voltage level, and 0 as a low voltage level. For a 'normal' UART, baud == bit rate, so 115200 baud = 115200 bit rate = 11.520kBps (assuming 8N1 which means 8bits data + 1 start bit + 1 stop bit).
RealTerm, a freeware Windows terminal program, lists these UART rates in its Baud menu: 110, 150, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600. However these are actually bits per second (bps), not baud -- see below. 110 baud was used by 8-level Teletypes like the ASR-33.
The value is taken straight from the baud rate tables in the reference manual of your MCU. The reference manual also explains that the fractional baud rate generator has four fractional bits so it can specify divisors with precision of 1/16 in decimal in 16x mode and with 1/8 precision in 8x mode. \$\endgroup\$ –
Therefore we bumped our baud rate up to 115.2 kbps, which reduces the round-trip time to approximately 250 milliseconds. This is still very slow, but it is an order of magnitude faster. We would go to a higher baud rate to reduce the cycle time, but due to run lengths and cable restrictions, going faster than 115.2 kbps could have a negative ...
Baud rate is the rate of change of polarity on your baseband, in telex days it was equal to the bit rate. With FM modems it was much larger, with PSK/FSK it was usually double and with modern modulation techniques it may be a fraction like 1/16 in 16PQAM modulation.
This article lists the default console settings within the following switch series: PowerConnect 2700, 2800, 3400, 3500, 5400, 5500, 6200, 7000, 8000, 8100
The UARTs typically used in RS232-type serial systems work by sampling the data line somewhere mid bit according to a division of the predefined baud rate base frequency clock. As such, if the sent data and receiver are not on the same frequency the "sample-point" will wander closer to the edge of the bit frame on successive bits.
I am using UART on STM32 board. I started a new project with CubeMx and the first step is to configure clock for UART. My question is what is the relation between UART baud rate a clock type and speed? for example if I want to use 115200 as a baud rate what clock speed should I use ? Is there an equation that matches clock speed with UART baud ...
Lets say the UART sys clk is 80MHz (I'm just guessing by reading Tiva UART info -- that's pretty high) -- And we choose clkdiv of 16 and want baud rate of 57600. Then Baud Rate Divisor = 80000000/ (16 * 57600) so Baud rate divisor is 86.8056 which should be set in some register of the Tiva UART. Registers are typically integers.
Obviously it is a 8bit ADC. Now the interesting thing for me is being able to decode this serial data on the oscilloscope. Here are two pictures, the first is when the micro is sending "0" to PC and the next one is when it sends "255". The data is being transmitted using 9600 buad and I can receive them at the PC terminal. First Pic. Second pic.