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8051 crystal frequency?

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TheSniper

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8051 crystal

hi guys
i have red some where in this forum that we could operate the 8051 MCU at 24 MHz
is that true ?
because i thaught that it operates at 12 MHz max
is it possible!!?


regards

TheSniper (+)
 

crystal frequency of 8051

There are many producers of microcontrollers based on 8051 core. In time, the core was enhanced in speed (one of the first to do that was Dallas Semiconductor) and there are producers that have products running at 40 Mhz external clock or even higher. Anyway it's a little bit difficult to add peripheral on the data bus at this high speeds due the timing constraints.
 

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    TheSniper

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at89s52 crystal

thanks marie65
ok,then what is the highest frequency for the crystal
for the 89c51?

regards

TheSniper (+)
 

crytal max & 8051

Hi. Look Cygnal site(www.cygnal.com) the made x51 up to 100MIPS.
\http://www2.silabs.com/tgwWebApp/appmanager/tgw/tgwHome;jsessionid=C4JgplMp9qC92XhS81pn16GXJFMpytgLLvQf2TqL4rz3DlnGGdnh!-2099199467?_nfpb=true&_pageLabel=GenericContentPage&contentObjectId=/public/web_content/products/Microcontrollers/Small_Form_Factor/en/SFF_matrix.htm

Best Regards
 

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    TheSniper

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crystal 12mhz in used in 8051

Check Maxim's line of 8051, they produce High Speed 8051 and Ultra Highspeed 8051's.
 

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    TheSniper

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available crystal frequency for microcontroller

The basic Philips 8951/52/54/58 family has the max clock frequency of 33MHz.
See this link:
**broken link removed**
 

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    TheSniper

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12mhz crystal free sample

from ATMEL like AT89S51, AT89S52, AT89S52 has max frequency 33Mhz
dependent on device mark.
if AT89S52-12 frequency max is 12 Mhz
if AT89S52-24 frequency max is 24 Mhz
if AT89S52-33 frequency max is 33 Mhz

Added after 44 seconds:


from ATMEL like AT89S51, AT89S52, AT89S52 has max frequency 33Mhz
dependent on device mark.
if AT89S52-12 frequency max is 12 Mhz
if AT89S52-24 frequency max is 24 Mhz
if AT89S52-33 frequency max is 33 Mhz
 

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    TheSniper

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crystal frequency in 8051 microcontrollers

Dont look at the frequency alone!. The operations/cycle is just as important. There are MCU's with 1 operation per cycle (clockcycle) while most of them are 1 operation per 6 or 12 cycles. So a 10Mhz system on 1 op./cycle is just as fast as a 120Mhz 12 cycle/op. If you need a very high speed 8051 concider a 16 bit (AVR or ARM) processor, otherwise you might end up buying extremely fast (expensive and more difficult) periphiral components.
 

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    TheSniper

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divide crystal frequency

Yes, not only frequency, but operations/cycle is just as important.

for 8051 family, some like AT89S51 operation/cycle is f crystal divide 12, with 12 Mhz crystal only 1 operation/uS as same as 1 Mhz speed.

if you use Maxim DS80C320, for operation/cycle is Frequency crystal divide 4, so if it have 12 Mhz crystal = 4 operation/uS as same as 4Mhz speed.
 

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    TheSniper

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12mhz cycle 8051

try At89C51 series, it can support up to 20MHz.

:)
 

maximum frequeny in 8051

what about analog device's mcu of 8051 and 8052 core?I 've receive free sample of aduc841 which is 20mpis.Does it can be programmed with the programmer of commom 8051?
thanks
 

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