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The USART's synchronous capabilities were primarily intended to support synchronous protocols like IBM's synchronous transmit-receive (STR), binary synchronous communications (BSC), synchronous data link control (SDLC), and the ISO-standard high-level data link control (HDLC) synchronous link-layer protocols, which were used with synchronous voice-frequency modems.
This was an early example of a medium-scale integrated circuit. Another popular chip was the SCN2651 from the Signetics 2650 family. An example of an early 1980s UART was the National Semiconductor 8250 used in the original IBM PC's Asynchronous Communications Adapter card. [5] In the 1990s, newer UARTs were developed with on-chip buffers.
Exar 16550. The 16550 UART (universal asynchronous receiver-transmitter) is an integrated circuit designed for implementing the interface for serial communications.The corrected -A version was released in 1987 by National Semiconductor. [1]
These type of baud rate detection mechanism are supported by many hardware chips including processors such as STM32 [1] MPC8280, MPC8360, and so on. When start bit length is used to determine the baud rate, it requires the character to be odd since UART sends LSB bit first – this particular bit order scheme is referred to as little-endian . [ 2 ]
The STM32 F4-series is the first group of STM32 microcontrollers based on the ARM Cortex-M4F core. The F4-series is also the first STM32 series to have DSP and floating-point instructions. The F4 is pin-to-pin compatible with the STM32 F2-series and adds higher clock speed, 64 KB CCM static RAM, full-duplex I²S, improved real-time clock, and ...
Texas Instruments Stellaris, STMicroelectronics STM32 F1 , NXP Semiconductors LPC13xx, LPC17xx, LPC18xx, Toshiba TMPM330, [35] Ember EM3xx, Atmel AT91SAM3, Europe Technologies EasyBCU, Energy Micro EFM32, Actel SmartFusion, mbed microcontroller, Cypress PSoC5, Infineon Embedded Power TLE986x, TLE987x: Arduino Due, [36] Pebble [37] Cortex-M4(F)
STM32 Nucleo [260] STMicroelectronics: STM32 Family Arduino connectors and ST Morpho headers SunDuinoPIC [102] PIC18F2550 or PIC18F4550: Microchip PIC Arduino hardware compatible board. Based PINGUINO Project. USB HID Bootloader. Breeze [261] [262] PIC: Breeze boards are prototyping platforms for 28-pin PIC microcontrollers.
BBFuino come with the ATmega328 controller, loaded with Optiboot (Arduino UNO's bootloader), compatible with Arduino IDE and sample code, design to fit breadboard for prototyping and learning, lower down the cost by taking out the USB to UART IC, so the board has the basic component to operate. BlockDuino [161] ATmega8 ATmega328 Blockduino