diggerdo wrote:

> Don't use a 8051. Takes 12 clocks to execute one instruction.

This is irrelevant unles very high speeds are necessary in which case there
are plenty of modern 8051s that execute in 6, 4 or even single cycles

> Use a modern micro that has a "capture" function.
> 

'Modern' 8051 variants have capture functions. The advantage of the 8-51 is
a wide range of hardware and performance variants to choose from but a
common instruction set and development tools.


Ian

diggerdo wrote:
> Don't use a 8051. Takes 12 clocks to execute one instruction.
> Use a modern micro that has a "capture" function.
> 
> Something like an Atmel ATmega88.
> 
> If you must use the 8051, use a variant. Dallas Semi (now Maxim)
> makes a tripler that executes instructions every 4 clock cycles.
> Crystal makes the only 8051 that executes an instruction in one clock cycle.

You should update your info :

I think you meant Cygnal, now Silicon labs ?
Their C51's clock to 100MHz

Atmel also make 1 cycle AT89LP2052's; clocks faster than the Mega88.

Maxim have 1 cycle 89C51's, also clock faster than the Mega88....

Others are also doing 1 cycle 80C51's....

Pretty much everything above the lowly 89C52, has Capture ability.


-jg