Seemanta Dutta wrote:
> Hi,
> 
> I have this basic doubt about the terminology of 8051 variants.
> I have read a couple of their data sheets and based on that
> here's my understanding, please correct me if I am wrong:
> 
> 8051  - ?? Probably generic name for the entire family, no part named as 
> such. right?
> 87C51 - EPROM variant. So must have a quartz window.
> 
> 89C51 - EEPROM/FLASH/ISP variant. No quartz window.
> 
> 89SC51 - Same as 89C51, but with some extra power packed features
> 
> My main area of confusion is between 89C51 and 89S51.
> 
> Is my understanding of the above correct?
> 
> Hoping to hear from you soon.
> 
> regards,
> Seemanta


It is worse than you think.
Many versions of 8XX51 are really 8052 variants.
Different manufacturers have different numbering systems.

Seemanta Dutta wrote:

> Hi,
> 
> I have this basic doubt about the terminology of 8051 variants.
> I have read a couple of their data sheets and based on that
> here's my understanding, please correct me if I am wrong:
> 
> 8051  - ?? Probably generic name for the entire family, no part named as 
> such. right?

Not amy more, but there was once. NMOS :)

> 87C51 - EPROM variant. So must have a quartz window.

Some had windows, most made do not. They are called OTP.
( one time program )

The windowed ones are nice to keep, often literally gold plated.

> 89C51 - EEPROM/FLASH/ISP variant. No quartz window.

Older ones are not ISP, most C51's released this century are ISP

> 89SC51 - Same as 89C51, but with some extra power packed features
> 
> My main area of confusion is between 89C51 and 89S51.

'S' is an Atmel (San Jose) tag, for Serial ISP.

'LP' is also ISP, newer 1 cycle core.

AT89C51RD2/ED2 are also ISP, but from Atmel's Europe arm, so have
a different naming detail.

Recent 8051 variants, tend to also have On-Chip debug. (even the tiny ones )

Cygnal were one of the leaders in JTAG Debug, ( now SiLabs )

Now also offered by Ramtron (40 MIPS cores), Winbond ( 10 Mips cores)
ST ( 9 MIPS cores ), and
Atmel (newest AT89LP releases have OnChipDebug )

-jg

Seemanta Dutta wrote:

> Hi,
>
> I have this basic doubt about the terminology of 8051 variants.
> I have read a couple of their data sheets and based on that
> here's my understanding, please correct me if I am wrong:
>
> 8051  - ?? Probably generic name for the entire family, no part named as
> such. right?

If mask ROM'd you might see one.

> 87C51 - EPROM variant. So must have a quartz window.

I have one here !

> 89C51 - EEPROM/FLASH/ISP variant. No quartz window.

Yes.

> 89SC51 - Same as 89C51, but with some extra power packed features

SC ? Haven't come across that. My faves currently are 89S52/3. Flash ROM which
is very handy for development and so well priced that EPROM versions are near
extinct.

> My main area of confusion is between 89C51 and 89S51.

Not that much difference AIUI. I've used both types without even thinking about
it. Read the datasheet. What info are you looking for ?

Graham

Le Sat, 10 Jun 2006 20:38:56 +0530, Seemanta Dutta a écrit :

> Hi,
> 
> I have this basic doubt about the terminology of 8051 variants.
> I have read a couple of their data sheets and based on that
> here's my understanding, please correct me if I am wrong:
> 
> 8051  - ?? Probably generic name for the entire family, no part named as 
> such. right?
> 87C51 - EPROM variant. So must have a quartz window.
> 
> 89C51 - EEPROM/FLASH/ISP variant. No quartz window.
> 
> 89SC51 - Same as 89C51, but with some extra power packed features
> 
> My main area of confusion is between 89C51 and 89S51.
> 
> Is my understanding of the above correct?
> 
> Hoping to hear from you soon.
> 
> regards,
> Seemanta

Your question is more an Atmel question than an 8051 question.
The S in the Atmel part means that the flash can be programmed using
the SPI interface.

For a more generic description of the 8051 here :

8051 was the original name of the microcontroller designed by Intel
The actual family name is MCS 51

A of February 1994 the original parts from Intel were described this way
Device name 8051AH 
Romless version : 8031AH
Eprom Version 9751H,8751BH
ROM bytes : 4k
RAM bytes : 128 bytes
16-bit timers : 2
Ckt Type : HMOS

Device name 8052AH 
Romless version : 8032AH
Eprom Version 8752BH
ROM bytes : 8k
RAM bytes : 256 bytes
16-bit timers : 3
Ckt Type : HMOS

Device name 80C51AH 
Romless version : 80C31AH
Eprom Version 87C51
ROM bytes : 4k
RAM bytes : 128 bytes
16-bit timers : 2
Ckt Type : CHMOS

At that time Intel had the 8051 or 8052 variances either phased out
or mostly phased out and replaced with their CHMOS replacements.
All original devices worked only at +5V

Intel has come up with a lot of variants including a low power
part 80LC51FA which I have used in a device for the oil industry.
Intel is very conservative with the specs and I have found this
particular device to use less current than any of the PIC available
in 1994.

There has been several other companies making parts that are
compatible with the MCS 51 family.
The part number will vary from manufacturers as they choose
the number they want.

For instance ST's latest such device is uPSD34xx
For example, the device I use is named
uPSD3434EV-4046
Freq 40 Mhz
1st flash :256k
2nd flash : 32k
SRAM : 8k
GPIO :35
VCC : 3.3V

Some of the features :
USB port (Support V2.0)
I2C master slave controller (833khz)
SPI Master Controller (1Mhz)
2 UARTs
IrDA Protocol : up to 115k baud
3 16 bit timers
PCA, 6 16 bit modules PWM,CAPCOM and timers
8/10/16 bit PWM operation
12 interrupt sources
JTAG debug

Pkg : TQFP52

It would take a long time to list all the variants. If you need to
know more you need to go to each manufacturer and read the data sheets
that they provide.
There are many who makes such devices. Atmel, Philips and ST being some
of the biggest ones.

One last note. The intel devices and many of the other sources ran at a
maximum of 12mhz clock with a divider by 12. This gave you a running clock
of 1Mhz. The ST device for examples runs at 40 Mhz with a divide by 4
instead of a divide by 12.
Several other manufacturers have similar parts as far as speed is
concerned.

-- 
Tired of Microsoft's rebootive multitasking?
then it's time to upgrade to Linux.
http://home.comcast.net/~mcatudal
We are the Cybernetic Entomology Experts

Seemanta Dutta wrote:

> I have this basic doubt about the terminology of 8051 variants.

<English lesson>
This is a question, not a doubt.  A doubt refers to a specific 
hypothesis, such as "I doubt it will rain today" meaning "I think it 
won't rain today."  Sometimes the reference is vague, such as "He thinks 
his team will dominate, but I have my doubts."  A doubt indicates that 
the doubter thinks that the hypothesis may be wrong, but is not sure. 
Sometimes one has "serious doubts" about a proposition when he is almost 
sure that it is incorrect.

A question, in contrast, does not indicate an expectation.
</English lesson>

> I have read a couple of their data sheets and based on that
> here's my understanding, please correct me if I am wrong:
> 
> 8051  - ?? Probably generic name for the entire family, no part named as 
> such. right?

I expect there was an original 8051 part, although it probably had 
variations for temperature, etc.  Nowadays, it is used to indicate the 
large family of processors using the same instruction set.

> 87C51 - EPROM variant. So must have a quartz window.
> 89C51 - EEPROM/FLASH/ISP variant. No quartz window.

Those sound right, in general.

> 89SC51 - Same as 89C51, but with some extra power packed features

As you get more specific, it makes sense to look at actual part numbers 
and their data sheets.  Different manufacturers may have variations in 
their parts for the same basic number.

> My main area of confusion is between 89C51 and 89S51.

Find some specific parts and compare the data sheets to discover the 
differences.  Google helps.

-- 
Thad

On Sat, 10 Jun 2006 20:38:56 +0530, Seemanta Dutta
<noone@slashdevslashnull.net> wrote:

>Hi,
>
>I have this basic doubt about the terminology of 8051 variants.
>I have read a couple of their data sheets and based on that
>here's my understanding, please correct me if I am wrong:

>89SC51 - Same as 89C51, but with some extra power packed features
>
>My main area of confusion is between 89C51 and 89S51.
>
>Is my understanding of the above correct?
>

For the Atmel parts I've used, both the 89C and 89S are electrically
erasable.  The 89C must be removed from the circuit for programming in
an eprom programmer, but the 89S can be programmed in-circuit using a
serial connection.

-- 
Peter Bennett, VE7CEI  
peterbb4 (at) interchange.ubc.ca  
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

Hi,

I have this basic doubt about the terminology of 8051 variants.
I have read a couple of their data sheets and based on that
here's my understanding, please correct me if I am wrong:

8051  - ?? Probably generic name for the entire family, no part named as 
such. right?
87C51 - EPROM variant. So must have a quartz window.

89C51 - EEPROM/FLASH/ISP variant. No quartz window.

89SC51 - Same as 89C51, but with some extra power packed features

My main area of confusion is between 89C51 and 89S51.

Is my understanding of the above correct?

Hoping to hear from you soon.

regards,
Seemanta