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In my project i want to interface a GSM modem and 24c02C i.e EEPROM (I2C based)to microcontroller. so now i am not understanding whether can i use same Rx-Tx pins to interface microcontroller (89s52) to EEPROM and GSM modem as well?? if not then is there any other microcontroller of AT89cxx/AT89sxx family with 2 serial ports? and which will support embedded c and assembly too!
Don't use the word "serial ports" like that.
I2C is a serial interface. But a completely different type of serial interface than the UART you would use for interfacing with the GSM modem.
There are lots of chips that have both UART and I2C in hardware. You can implement a I2C master in software quite easily too.
What 8051 processor will not support "embedded c" or assembly?
oh yeah.. no no i didn't mean that.. 8051 supports..
okay i will Google.. :) thank you:)
No i didn't mean that.. They do!
I came across 89C51RE2. this microcontroller has 2 UARTs n it belongs to 8051 family too!
What you think about this microcontroller? Is it okay?
Is/are there any other microcontrollers which will satisfy my basic needs i.e.
1) 2 UART's 2) 8051 family
I want your opinion. Please recommend me.. I searched on "Parametric search" available on Keil.com..
try the paramedic search at nxp
But your original post does not contain any information indicating that you need two UART.
The I2C-connected memory do not consume a UART. I2C is a completely different type of serial interface, just as SPI, Ethernet, USB, Firewire, ...
yeah but the problem is that if i use 89s52, then i shall be connecting EEPROM (I2C based) to Rx-Tx pins.. and data will be continuously read and written from and to respectively EEPROM. But i need to connect a GSM Modem also which will also need Rx-Tx pins..
So better i should use a controller with 2 UARTs..
Am i making any mistake?
okay! thank you:)
Why would you connect an I2C device to the RX and TX pin of an UART? A UART is not designed to communicate with an I2C device. An I2C device has data and clock. Not RX and TX. It is a synchronous serial interface, while a UART implements an asynchronous serial interface.
Buy a processor with 100 UART and that will still make you happy if the processor doesn't also have I2C support. I2C != UART != SPI != Ethernet != USB != ...
ohk! now i am getting you:)
what EEPROM? if 24.... you can NOT use the UART Erik
can you please elaborate?
Can i get your e-mail ID?
Please :o
NO, the popurpose of a forum is that everybody learns
ANSWER THE QUESTION
what EEPROM?
Erik
ohk.. sorry!
Well.. This is the link which i was referring.
www.electronicsforu.com/.../view_article.asp
Here EEPROM is connected to Rx-Tx pins.. :o
That link is just 1 part of my project.
In 2nd part i am going to interface a GSM modem to controller. (Serially)..
So that Whenever bike exceeds a particular speed limit a message will be sent to predefined number..
in a way yes, but actually no
the pins, in this case are not used as Rx and Tx, but as regular port pins.
connect your EEPROM to two other pins, preferably those used for hardware I²C by a better chip than the one you have chosen. Based on the impression of your abilities your confusion gives me, I will not recommend that you tackle bit-banged I²C