Replace an AT89C2051 with AT89S2051

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red_thunder

Joined: 25 Jul 2005
Posts: 3

16 Sep 2007 16:56 at89s2051 programmer

Hi!

If anyone could help, I would like to know if I could replace an AT89C2051 with AT89S2051 without any modification in hardware and software.
Let me explain, I have an project of ELEKTOR (IR light dimmer) based on the C2051 uC that cannot be programmed through the ICSP programmer that I already have, so I would like to replace it with S2051 uC if it is possible.

THANKS !
Andrej

nandhu015

Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India

16 Sep 2007 17:45 at89s2051

Hi

Yes you can replace s2051...

Take care of serial programming lines if you decide to program it in the board

Regards
Nandhu

vijaya_narayana

Joined: 12 Jun 2007
Posts: 147
Helped: 9

17 Sep 2007 10:03 at89s2051 isp

it can be done if you have any douts check atmel website for any application notes for migrating from 89c2051 to 89s2051

simrantogether

Joined: 11 Sep 2007
Posts: 41
Helped: 1

17 Sep 2007 11:08 at89s2051 project

just replace...

there is no difference..

89s51 is very same as 89c51 in everything..

Also, AT89C2051 and AT89S2051 are also very same..

One small difference..:

89s51 has one small facility.. it can be both programmed with ..

1. a programmer..
2. serially ( ISP)

Regards,

Simran..

elec-eng

Joined: 16 Nov 2006
Posts: 277
Helped: 15

18 Sep 2007 17:00 difference between at89s2051 and at89c2051

i did it before and there was no problem at all

mkiani

Joined: 11 Apr 2007
Posts: 107
Helped: 1

25 Sep 2007 10:56 at89s2051 isp programmer circuit

u can replace s series by c series without modifying in hardware .in fact s series is same c series just we can program s series with isp.

red_thunder

Joined: 25 Jul 2005
Posts: 3

25 Sep 2007 16:07 at89s2051 problem

Hi!

I would like to thanks for all your answers.

I have only one another question. Could I attach my USB ISP programmer (it support AT89S2051) direct to the MOSI, MISO, SCK, RST, VCC and GND port of the uC or I must add between some resistors, on my hardware, becouse I have never designed an uC with ISP programming capability.

Thanks for all your answers.
Andrej

nandhu015

Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India

26 Sep 2007 2:53 at89c2051 application notes

Hi

connect directly to port pins dont use any resistors.

It may cause problems

The circuit will help me to guide you better

Nandhu

red_thunder

Joined: 25 Jul 2005
Posts: 3

26 Sep 2007 18:17 difference between atmel 89c2051 and 89s2051

Thanks for your help, Nandhu
I have attached the circuit diagram to understand better what I have to do.

Thanks
Andrej

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voodoo3007

Joined: 28 Jun 2006
Posts: 30
Helped: 1

27 Sep 2007 18:21 dimmer at89c2051 elektor

no probs at all....it will work

nandhu015

Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India

28 Sep 2007 2:25 burning circuit for 2051

Hai Red_thuner

Thanks for your credits..

Shall i know whether you are able to program incircuit??

My advice : Please shift all the inputs or outputs connected to isp pins to someother free pins (I can see lot of free pins).

nothing else

Regards
Nandhu

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28 Sep 2007 2:25 Ads

~E3016~

Joined: 11 Nov 2006
Posts: 85
Helped: 6

01 Oct 2007 8:49 serial isp programmer for at89s2051

My experience with this ISP stuff is, the reset pin must not connect to the other components while the ISP do its 'burning', so you may have a jumper when the circuit is in downloading process and when the circuit is running its program