Basic 8051 Tutorial 6 2015-04-17

Thread starter Ian Rogers
Start date Apr 17, 2015

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Ian Rogers

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Apr 17, 2015

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Basic 8051 Tutorial 6 - SPI and I2c

We start with the SPI bus... The main idea behind serial buses is to save on micro-controller pins... SPI requires three pins or more if there are multiple devices.. The serial transfer on an SPI bus is circular.. The inputs and outputs of each buffer are connected and the shift is synchronized.
View attachment 92076

As data is shifted out of the SDO pin of a micro, the data is shifted into the SDI pin of the device...The data in the device is simultaneously shifted back into the micro....