Hello everybody..I hope you pupil have great time.. Actually we are using 8051 8 bit controller for our weighing scale product since 15 yrs.. External ADC,external USB,external RTC etc .. Now need to go with ARM to taste the new technology.. I'm a debut in ARM..So pls give me some ARM family details which must have internal features like USB support, LCD, UARTS more than 3 and as usual SPI /I2C interfaces.. and also camera support.. And i heard that Atmel ARM processor have inbuilt Zigbee? Is it so?? Therefore,i need the features of ARM processors which makes our circuit design in compact..
You're inferring too much design knowledge, it translates to someone designed this 15 years ago, has left, and we can't buy the parts any more. All our competition is using newer, and cheaper technology, and the Chinese products are far better. Our customers are buying these other products, and not ours, and it's nearly 2013Q4
Thoroughly understand the current design, review current Cortex-M3/M4 parts that have your minimum features, buy a couple of dev boards and experiment. When you have enough knowledge to make a selection that works for you, do so then.
There are still plenty of current, low-cost 8051-based devices available...