Hi guys, Here is the situation I've 89c51 microcontroller board which I want to connect with PC as well as GSM but as everybody knows it(8051) has only one UART so one solution is try using 87xx or 83xx series of controller but that means I'll have to change my programmer. So what I'm thinking is I'll use simple mux/demux for Tx/Rx of 8051. I want to know will it be o.k.? Can simple AND or OR gates can handle data rate of 9600bps?
Thank you very much in advance.
Take a look at http://www.silabs.com go to the microcontrollers / selector or developement section (about in the middle of the page). they have many dual UART chips and cheap developement kits and target boards ranging from $35 US to around $199. Around $99 you can get the target board and a serial or USB debug adapter ($35 US by itself) that can be used with most of their products. They have lots of free software to use both UARTs onboard. The developement kits include a CD with all the docs for all their kits and a Keil tool chain that runs the debugger and an evaluation compiler. It has lots of other goodies to.
I detest the SILabs deviates (f3x-up), but like immesily the SILabs derivatives (f0x-f2x) and so this is, by no means, a 'do not use silabs post' to argue against the one above. I use, almost exclusively, SILabs derivatives in my designs and the debugging facilities can not be acquired better for the price.
I have no idea which access the OP has to various brands. I can imagine that SILabs may not be available in Farawayistan.
THUS, when such comes up, why not use the available tool, the Keil device database
http://www.keil.com/dd/parm_search.asp
which with a few keystrokes will give you a lost of each and every such chip.
Erik