Spi protocol pdf
The Serial Peripheral Interface ( SPI) is a synchronous serial communication interface specification used for short distance communication, primarily in embedded systems. SPI Core Core Overview SPI is an industry- standard serial protocol commonly used in embedded systems to connect microprocessors to a variety of off- chip sensor, conversion, memory, and control devices. The SPI core with Avalon® interface implements the SPI protocol and provides an Avalon Memory- Mapped ( Avalon- MM) interface on the back end. Serial Peripheral Interface ( SPI) SPI Status Register ( SPSR) interrupt flag: set when serial transfer is complete write collision: set if SPDR is written during a receive transfer 2x clock rate: if set, doubles clock rate in master mode reserved bits SPI Data Register ( SPDR) SPDR is a read/ write register used for data transfer. SPI tradeoffs: the pros and cons • Pros – Fast for point- to- point connections – Easily allows streaming/ constant data inflow – No addressing in protocol, so it’ s simple to implement – Broadly supported • Cons – Slave select/ chip select makes multiple slaves more complex – No acknowledgement ( can’ t tell if clocking in garbage). SPI Block Guide V04. 01 13 Section 1 Introduction Figure 1- 1 gives an overview on the SPI architecture. The main parts of the SPI are status, control and data registers, shifter logic, baud rate generator, master/ slave control logic and port control logic. Figure 1- 1 SPI Block Diagram 1. How does SPI work? What does SPI stand for? SPI uses a separate apparatus to help in this data transfer between micro- controllers or master and slave devices. An SPI generally has a clock, slave selects, multiple slaves and data lines. Alongside there are various other instruments too, that facilitate in this data flow. It is also called a synchronous data bus.
The usage of SPI is not limited to the measuring area, also in the audio field this type of transmission is used. The SPI ( this name was created by Motorola) is also known as Microwire, trade mark of National Semiconductor. Both have the same functionality. There are also the extensions QSPI ( Queued Serial Peripheral Interface) and MicrowirePLUS. What are the features of SPI protocol? receiving data, and can do so at very high speeds. The SPI protocol is also simple enough that you ( yes, you! ) can write your own routines to manipulate the I/ O lines in the proper sequence to transfer data. ( A good example is on the Wikipedia SPI page. ) If you' re using an Arduino, there are two ways you can communicate with SPI devices: 1. The Serial Peripheral Interface ( SPI) is a synchronous serial communication interface specification used for short- distance communication, primarily in embedded systems. The interface was developed by Motorola in the mid- 1980s and has become a de facto standard. Typical applications include Secure Digital cards and liquid crystal displays. Full duplex communication.
What is SPI communication?