| ??? 05/08/09 17:05 Modified: 05/08/09 17:17 Read: times |
#165168 - Not at all! Responding to: ???'s previous message |
Richard said:
As it happens, however, "one-clockers" operate at nominally 12 times as fast as the original 80C51. No, they do not! Look carefully at the table from Jan http://www.efton.sk/51comp/51comp.htm to see, that this isn't true: 
If you were right, then you should see the same numbers in the columns "12x" and "1x". This is valid for instructions "ADD A,Rn" and "ADDC A,Rn", e.g., but not for "ADD A,direct" and "ADD A,@Ri", e.g. There are many many many instructions, where the 1-clocker is NOT 12 times faster than the standard 12-clocker, but only 6 times or even less. Richard said:
If you divide that 200-210 MHz by 12, it suggests one would attain nominally similar performance with a one-clocker at about 17.5 MHz. Why dividing by 12?? It's a 1-clocker! Compare the 210MHz with your beloved 1-clocker running at 33MHz, then you have something comparable. Kai |
