There are two types of triggering mechanisms on the clock signal that are used to intimate the receiver about the data: Edge Triggering and Level Triggering.
The clock signal must be supplied by the Master to the slave (or all the slaves in case of multiple slave setup). The transmitter and receiver are connected with separate data and clock lines and the clock signal will help the receiver when to look for data on the bus. it uses a dedicated clock signal to synchronise the transmitter and receiver or Master and Slave, speaking in SPI terms.
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SPI is a Synchronous type serial communication i.e. The other type of Synchronous Serial Communication Protocol is I2C (Inter – Integrated Communication, often called as I Squared C or I Two C). When we say short distance communication, it often means communication with in a device or between the devices on the same board (PCB). If the baud rates of transmitter and receiver are not matched, the data sent from the transmitter will not reach the receiver properly and often garbage or junk values are received.įor short distance communication, Synchronous Serial Communication would be a better choice and in that Serial Peripheral Interface or SPI in particular is the best choice. Start bit and Stop bits and also a pre agreed data transfer speeds (typically 9600 bps). In order to overcome this, UART uses synchronisation bits i.e. In this type of communication, there is no control over the data sent or whether the transmitter and receiver have same data rates. In UART (or any common serial port), where the communication happens over RX and TX line, there is no clock signal i.e.
We have seen about UART in the previous article. SPI Interface bus is commonly used for interfacing microprocessor or microcontroller with memory like EEPROM, RTC (Real Time Clock), ADC ( Analog – to – Digital Converters), DAC (Digital – to – Analog Converters), displays like LCDs, Audio ICs, sensors like temperature and pressure, memory cards like MMC or SD Cards or even other microcontrollers. Serial Peripheral Interface (SPI) is a master – slave type protocol that provides a simple and low cost interface between a microcontroller and its peripherals.
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Serial Peripheral Interface or SPI is a synchronous serial communication protocol that provides full – duplex communication at very high speeds.
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