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I think this is not true.
It depend on your application.
DSP is strong in digital signal processing.
But, if you only do interrput management, memory manage (MMU)... some general CPU job, general purpose microP maybe is stronger.
The fundamental difference between DSPs and microcontrollers can be derived from the names: DSPs are more efficient when used for signal processing while microcontrollers are better at controlling and timing.
DSPs are preferred for tasks like signal filtering, modulation and so on.
Microcontrollers are efficient when controlling other hardware, timing things, lcd's that sort of thing.
Microchip recently launced the dsPIC range which is a nice hybrid between the two designs.
DSP is powerful for computation, while MCU is generaly not.
Generally speaking, MCU is easy for IO control and MCU was
designed for it originally. While general DSP's are not.
However, some companies start to merge the advantages of
MCU/MPU and DSP. The borderline of MCU/MPU and DSP will
becomes unclear and unclear. For example, dsPIC of Microchip.
In computer architecture, all processor inlucde DSP use interrput and control register to control it's IO.
DSP and MP are the same.
Maybe you will say, DSP should only do calculating.
But, what I mean is DSP also can do IO well.
And the MP is not stronger in IO than DSP, it's not the point.
Right?
And, one thing need to tell.
Some DSP company start to develop their DSP also include MP's capabilities.
They can run OS very well. Handle all peripherals and do MMU.
However, MP's company develop their MP to include DSP capabilities.
Like intel processor include more and more instruction sets for media processing now.
Maybe that's why many people still confuse about the different between DSP and MP.
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