Lpc2000

--- In lpc2000@yahoogroups.com, "soren_t_hansen" <
soren_t_hansen@y...> 
wrote:
> I'm making an application on a LPC2132, that must performe a number
> of DSP operations. To find out how many operations I can perform, I
> need to know how many clock cycles it takes the LPC2132 to performe 
> a 16 bit times 16 bit = 32 bit multiplication?

The ARM7TDMI has a 8x32 hardware multiplier (the "M" in TDMI), and
the number of cycles the MUL instruction takes depends on the 
multiplier operand:

2 cycles if bit  8-31 are all zeroes or all ones
3 cycles if bit 16-31 are all zeroes or all ones
4 cycles if bit 24-31 are all zeroes or all ones
5 cycles in all other cases

So in your case, a MUL takes 2 or 3 cycles.

Karl Olsen