Hai
i wanna connect one 8051 micro controller with 3 devices (GSM, Zigbee, electronic energy meter). The communication between these four are through serial port so please guide me whether i can connect the three devices with one microcontroller or i have to use separate microcontroller for all three devices
It's 2014, might you consider a Cortex-Mx type processor, with half a dozen USARTs?
Thank you Mr.Westonsupermare Pier
but it is a small level project so we spending money for cortex have to be avoid so we using oly 8051.
Cortex-chips aren't really more expensive.
And they have the advantage that most new boards developed for hobbyists are using Cortex chips because they are so powerful in relation to their cost.
My current favourite is the NXP LPC800 series.
Lots of on chip peripherals (up to 3 UARTS, which might be good for the OP), incredibly versatile pin allocation and cheap as those proverbial chips (something like 85p sterling one off here in the UK).
For me, the '51 is now close to being not even considered.