The driving circuits on the bus cause the bus to be pulled down to 0 if any node on the bus pulls the bus down (making 0 dominant over 1).There are two broad types of serial communication: synchronous and asynchronous.
There are a very large number of different standards and protocols for serial communication, ranging from the very simple to the seriously complicated. It is important to match the right protocol with the right application. The 16F873A microcontroller has two extremely flexible serial ports. The cost of flexibility is a significant level of complexity in grasping their use. Therefore, it is often worth adapting publicly available routines to use, rather than starting from scratch in writing new code. Uart Communications Between Two Devices Full Chapter URLView chapter Purchase book Read full chapter URL: Sensor hubs Manish J. Gajjar, in Mobile Sensors and Context-Aware Computing, 2017 Serial Communication Interface The serial communication interface (SERCOM), as shown in Fig. I 2 C, SPI, or USART. The SERCOM serial engine consists of: Figure 4.7. SERCOM serial engine block diagram. A transmitter made of a write buffer that feeds into a shift register. A receiver made of two-level receive buffer and a shift register. Uart Communications Between Two Devices Generator To GenerateA baud rate generator to generate internal clocks needed for communication. An address matching logic which is present for SPI and I 2 C mode. It can be used in three different modes as shown in Fig. One address with mask: In this mode the address from address register is compared to Rx shift register content while ignoring bits set in the mask to generate a match. Two unique addresses: In this mode the two unique addresses stored in address register and address mask are compared with Rx shift register content to generate a match. A range of addresses: In this mode the range of addresses in Rx shift register that lies in between (and including) the address in address register and in mask register will generate a match. Figure 4.8. Address matching modes in SERCOM. View chapter Purchase book Read full chapter URL: Automotive and Aerospace Systems Marilyn Wolf, in Computers as Components (Fourth Edition), 2017 9.3.1 CAN bus The CAN bus Bos07 was designed for automotive electronics and was first used in production cars in 1991. ![]() CAN bus is used for safety-critical operations such as antilock braking. ![]() CAN is well suited to the strict requirements of automotive electronics: reliability, low power consumption, low weight, and low cost. CAN uses bit- serial communication and runs at rates of 1 Mbs over a twisted pair connection of 40 m. Physical layer As shown in Fig. Uart Communications Between Two Devices Drivers And ReceiversCAN bus has its own electrical drivers and receivers that connect the node to the bus in wired-AND fashion. In CAN terminology, a logical 1 on the bus is called recessive and a logical 0 is dominant.
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