how is 8515/8535 better than 8051?

Question

please give details when 8515/8535 would b preferred over 8051

Answer 1

i think the biggest reason would be speed. most instructions in the 8515/8535 are 1 cycle per instruction, where in the 8051 they are anywhere from 12 cycles - 4 cycles depending on the one you use.
Atmel's best is 6 cycles, where Dallas has 4 cycle. Even then there is Cygnal (I think that is their name still) has a 1 cycle micro that can run up to 50mhz. So even speed is a lame excuse.
the other guy mentioned ISP (in-system programable) as a reason, but some 8051's have that capability also. They also can have A/D, I2C functionality too.

To answer your question, I dont know. The 8051 is pretty darn good!!

Answer 2

I don't remember all of the details, but IIRC the 8515 and 8535 are both flash prom so they can be reprogrammed a lot faster (and in-system) and I think they both have a lot more on-chip RAM. I don't remember if they have the A/D and D/A peripherals on chip, or if they have the i²c interface. And I'm pretty sure they have a 4 phase clock instead of the 6 phase clock so they execute faster.

You *can* get full data sheets (in .PDF format) as well as free copies of the Adobe Acrobat reader to look at them with


Doug