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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!
I would strongly suggest that you get a chip with at least two UARTs - since one will be occupied by the GSM, you should have another free for debug purposes.
(The parametric search lists 104 with I2C + 2 UARTs)
And, if you're considering adding GPS at a later date (which is a very common next step), then get a chip with at least 3 UARTs...
... UARTs ...., you should have another free for debug purposes. unless you are smart and get a chip with JTAG debug
Erik
Is that a new alias you got mr Malund?
By the way - JTAG is nice. But a serial port for trace output can be invaluable anyway.
Is that a new alias you got mr Malund? Nope, sometimes the wonderful product from Mr. Gates land up in strange places when returning to a window.
fixed
a serial port for trace output can be invaluable anyway I have had more trouble than benefit from printf cebugging, it creates havoc on the timing. I have no doubt that thise that are more into 'processing' that I/O can find some value.
yeah i agree:)
what is the problem with 89c51re2??
Read rhe datasheet, maybe there is a 'problem', maybe not.
If you want me to read the datsheet for you, send me a check.
no u getting me in the wrong way..:o in previous comments i had got a reply that "u should choose the microcontroller better than the one u have chosen.." thats why i am asking...
no u getting me in the wrong way..:o that is between you and micro (u)
in previous comments i had got a reply that "u should choose the microcontroller better than the one u have chosen.." NO, YOU DID NOT, the responders here so not use Stupid Monkey Shit, you got You should choose the microcontroller better than the one you have chosen.
thats why i am asking... I can't tell what is the problem with 89c51re2?? without reading the dayasheet, do that yourself. The requirements were revealed to you above.
ok ok:)
what does RE mean in case of 89C51RE2 ??
The manufacturer's datasheet will explain the part numbering scheme
RE means RAM EMABLED
So you think that other chips have the RAM dis-abled?!