AT89C51 interfacing I2C, ADC and SPI

[fan174]

AT89C51 does not have on chip (I2C, ADC and SPI) but some time we use i2c device like RTC. How does AT89C51 communicate with ADC device, SPI device and I2C device while AT89C51 doesn't have on chip ADS, I2C, SPI hardware. Does it require external hardware to communicate ?

 

[Nigel Goodwin]

No, you emulate it in software - have you considered using google to do a simple search before asking on a forum?.

 

[Ian Rogers]

Some 8051's have I2C and some have SPI, but as most don't I have witten a tutorial here.https://www.electro-tech-online.com/articles/basic-8051-tutorial-6.714/ There are one or two 8051 tutorials in the article section..

 

[fan174]

No, you emulate it in software - have you considered using google to do a simple search before asking on a forum?.

Yes Is there specific hardware in at89c51 that support I2C, ADC and SPI ? then why we need some external chip like adc 0804

 

[fan174]

Some 8051's have I2C and some have SPI, but as most don't I have witten a tutorial here.https://www.electro-tech-online.com/articles/basic-8051-tutorial-6.714/ There are one or two 8051 tutorials in the article section..

I think At89c51 doesn't have i2c , spi, and ads ?
if I want to communicate i2c device , adc device , spi device. Do i need to purchase adc chip, i2c chip, and adc chip ?

 

[Ian Rogers]

There are many 8051 derivatives that have ADC I2C and SPI in hardware, but its easier if you only have an AT89C51 to do it in software... The P89LP952 and P89LP954 have usart SPI I2c and ADC
https://uk.farnell.com/nxp/p89lpc952fa-512/mcu-8bit-8051-18mhz-plcc-44/dp/2314894?MER=mktClearanceA

 

[fan174]

There are many 8051 derivatives that have ADC I2C and SPI in hardware, but its easier if you only have an AT89C51 to do it in software... The P89LP952 and P89LP954 have usart SPI I2c and ADC
https://uk.farnell.com/nxp/p89lpc952fa-512/mcu-8bit-8051-18mhz-plcc-44/dp/2314894?MER=mktClearanceA

In what case we need hardware ic ? like 0804

 

[Ian Rogers]

Did you look at my 8051 articles? I did an ADC with the MCP3008 (SPI) and a DAC MCP4921 (SPI)..All this with a basic 8051...

There are several SPI RTC units, which will use the same interface..

 

[fan174]

Did you look at my 8051 articles? I did an ADC with the MCP3008 (SPI) and a DAC MCP4921 (SPI)..All this with a basic 8051...

There are several SPI RTC units, which will use the same interface..

by reading a lot, confused

What would i need , If I want to measure the device temperature using thermocuple then what I have to buy ? Do i need only MCP3008 (SPI) ? Or I need ADC 0804 ?

 

[Ian Rogers]

Its up to you....
The ADC0804 is a single channel parallel 8 bit ADC which uses one of your ports plus several control lines..

The MCP3008 is a 4 channel 10 bit ADC with an SPI interface that uses 3 pins... Both will do the job!! However!! I have written the code for the MCP3008 and it's half the price...