• State Not Answered
  • Locked Locked
  • Replies 4 replies
  • Subscribers 22 subscribers
  • Views 5105 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

8051 vs 80251

eliahu c.

Hi all

what are basic differences between the 8051 family and the 80251 family ?

Are they close family relatives?

Thanks
Eliahu

Parents
  • 0 in reply to ²erik malund

    Just as the Z80 extended the 8080 processor, a 251 processor got extra instructions by use of an extension byte.

    But the main advantage was that it consumed much less clock cycles/instruction. But you don't need a 80251 for that - many newer 8051 chips works with way less than the 12-cycle concept of the original 8051. And at way higher clock frequencies too. And there are 8051 chips supporting more than 64kB of code space.

Reply
  • 0 in reply to ²erik malund

    Just as the Z80 extended the 8080 processor, a 251 processor got extra instructions by use of an extension byte.

    But the main advantage was that it consumed much less clock cycles/instruction. But you don't need a 80251 for that - many newer 8051 chips works with way less than the 12-cycle concept of the original 8051. And at way higher clock frequencies too. And there are 8051 chips supporting more than 64kB of code space.

Children