AVR-Chat

techy fellow wrote:

>Hi guys,
>
>Is there another 8051 chip that can replace the DS5000T chip from Dallas ? I 
>want to construct a Real-time controlled AC relays published in 'Reynolds' 
>website (http://www.rentron.com/Project5.htm ) for my fish tank but upon 
>checking the price of the DS5000T MCU, I was shocked. It is priced at about 
>USD73.00 per piece in Singapore. Too much for me to swallow.
>
>I was thinking, since the DS5000T is from the 8051 family, I am not sure whether 
>are there any equivalents say, from ATMEL. Or, if any of you know of a similar 
>project (the MCU must control at least 2 relays preferably, 4) but is using a 
>different MCU. I've some stock (commonly use types though) on both PICs 
>and AVRs. I've some DS1307 (Real-time clock from Dallas) too. There is another 
>8051 project from Reynolds using ATMEL AT89C2051 but it is actually an alarm 
>clock. I think I can modifiy the circuit to control a relay but I do not know 
>how to add codes to use another PIN for another relay.
>
>Many thanks in advance.
>Davis
>
>  
>

avr 8515 or atmega8515 or atmega162 is pin compatable with standard 8051 
chips

what about ds80c320 or dsc80c420
http://www.maxim-ic.com/MaximProducts/Microcontrollers/HighSpeed.htm

Atmel has quite a few 8051's
see  http://www.atmel.com/dyn/products/devices.asp?family_id=604
http://www.atmel.com/products/8051/

If the at89s2051/4051 has enough pins

for a few other 8051 projects
http://members.optushome.com.au/donmck/vicuni/
http://www.8052.com/tutorial.phtml
http://www.8052.com/codelib.phtml

have you had a look at the app notes from a few of the manufacturers ?
intel  
http://developer.intel.com/design/mcs51/index.htm?iid=ipp_embed+micro_51_251&
http://search.intel.com/corporate/search.asp?category=ALL&SearchCrit=ALL&mh=200&isoCode=en&MimeType=ALL&version=2.0&q1=8051+application+notes&x=0&y=0
atmel  http://www.atmel.com/dyn/products/app_notes.asp?family_id=604
dallas   http://www.maxim-ic.com/an_prodline2.cfm/prodline/25
  http://www.maxim-ic.com/solutions.cfm/cpk/63/pl_pk/0/ln/en/more/an
etc

http://www.kmitl.ac.th/~kswichit/
http://alds.stts.edu/APPNOTE/INDEX.HTM

also worth looking at
Myke Predko's Programming and Customising 8051Microcontroller
http://www.myke.com/8051book.htm

Alex