If more the one SPI devices is connected to the same bus, then we need four ports and use the fourth port ( SS pin on the ATMega168 microcontroller) to select the target SPI device before starting to communicate with it.
Codevision enc28j60 serial#
The standard Serial Peripheral Interface uses a minimum of three line ports for communicating with a single SPI device (SPI slave), with the chip select pin ( CS) is being always connected to the ground (enable). The principal we learn here could be applied to other types of microcontroller families.
Codevision enc28j60 how to#
In this tutorial we will learn how to utilize the Atmel AVR ATMega168 SPI peripheral to expand the ATMega168 I/O ports and to communicate between two microcontrollers with the SPI peripheral where one microcontroller is configured as a master and other as a slave.
Codevision enc28j60 full#
The last three interface types is used for long connection between the microcontroller and the devices, up to 1200 meters for the RS-485 specification, while the first three is used for short range connection.Īmong these serial data transfer interface types, SPI is considered the fastest synchronous with full duplex serial data transfer interface and can be clocked up to 10 MHz that is why it is widely used as the interface method to the high speed demand peripheral such as the Microchip Ethernet controller ENC28J60, Multi Media Card (MMC) Flash Memory, Microchip SPI I/O MCP23S17, Microchip 128K SPI EEPROM 25AA128, ADC, sensors, etc. Currently there are few types of modern embedded system serial data transfer interface widely supported by most of the chip’s manufactures such as I2C (read as I square C), SPI (Serial Peripheral Interface), 1-Wire (One Wire), Controller Area Network (CAN), USB (Universal Serial Bus) and the RS-232 families (RS-423, RS-422 and RS-485). Because usually we only have a limited I/O port left than the logical choice is to use the serial data transfer method which usually only requires from one up to four ports for doing the data transfer. Sometimes we need to extend or add more I/O ports to our microcontroller based project. Using Serial Peripheral Interface (SPI) Master and Slave with Atmel AVR Microcontroller Jby rwb, under Microcontroller.
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