![]() ![]() The clock controls the timing of the data transfer.ĭata (MOSI )is sent out of a shift register in the Master SPI device along with a clock signal (SCK) while at the same time another shift register receives data from the slave (MISO, ). ![]() It works by transferring data one bit at a time between two devices with the master device sending the clock signal (SCK). Transmission of data from a master device to one or more slaveĭevices over short distances and at high speeds (MHz). Processor, and it was quickly adopted by many other manufacturers as a defacto standard. The SPI interface was designed in the 1970s by Motorola, who used it in their 68000 These interfaces both available on processors and microcontrollers. Only other real competition is the I2C bus which is why you often see Memory and SPI SRAM can easily be added to any system. The SPI PIC interface allows connection of peripherals using a high speed serial interface. Note: The last signal SS or slave select is separate from the protocol and is usually implemented as an enabling control pin from the microcontroller. ![]() ![]() Get to 16, 32 bits and more it gets far more difficult). Manage an 8 bit bus routing it through a several layer PCB but when you Traditional parallel bus with a serial interface. Primiary purpose is to reduce on-PCB wire routing by replacing the Bus is a high speed, 3-wire, serial communications protocol (4 if you include SSn - see below). ![]()
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