56F8300 PERFORMANCE TEST?

[DoktorLekar]

I programmed "MC56F8322" in a way that it toggles one pin as fast as it can and the result was around 500kHz .
Is this possible for a controller that runs at 60MIPS?

Thank you!

[mvinkler · Accepted solution]

It should be about 5.5MHz, but it depends on your code (see disassembled code in CW). I tried it on 56F8323 with 60MHz bus clock and I measured 5.5MHz on the GPIO_A0 pin. See the following disassembled code:

TEST:
bfset #1,X:0xF2E1 (3 cycles) ; set the high level
bfclr #1,X:0xF2E1 (3 cycles) ; set the low level
bra TEST (5 cycles)

60MHZ / 11 cycles = 5.5MHz

[DoktorLekar]

Yes thats right...

My line in c++ was :

Code:

for(;;){negbit(0);}

 

Message Edited by Alban on 2006-10-26 11:35 AM