AT89S51 VS AT89C51 - reprogramming issue

[dimas_lilik]

AT89S51 VS AT89C51

I have a problem with the AT89S51 and AT89C51.
Why AT89C51 easily damaged if the reprogram continue, while AT89S51 safe.
Please help.

 

[nandhu015]

AT89S51 VS AT89C51

Hai

I had used both 89c and 89s for a long time. I dont have such problems. Both got unusable as we program it for many times.

May be the problem is with programmer. What programmer are you using ?

Nandhu

 

[pranam77]

Re: AT89S51 VS AT89C51

I have a problem with the AT89S51 and AT89C51.
Why AT89C51 easily damaged if the reprogram continue, while AT89S51 safe.
Please help.

Coz the AT89C51 flash memory can be programmed upto 1000 times while the AT89S51 can be programmed from 1000-10000 times.

Anyway..the difference between the two chips are as mentioned below.
The main difference between 89C51 and S51 lies in the following points:

Pin function: Pins almost identical changes were, in the AT89S51 in P1.5, P1.6, P1.7 have a second function, that is, the second 3-pin serial ISP function formed programming interface.

Programmability: AT89C51 only supports parallel programming, But AT89S51 supports both parallel programming and ISP programming.
Voltage in the programming area, AT89C51 in addition to normal programming voltage of 5V, another 12v is needed for Vpp. But AT89S51 just need to be 4-5V.

Endurance: AT89C51 flash memory can be programmed upto 1000 times while the AT89S51 can be programmed from 1000-10000 times, so that the learner repeated the beginning of a more favorable programmer, reducing learning costs.

Frequency: AT89C51 limits the operating frequency is 24MHZ, and AT89S51 maximum operating frequency is 33MHZ, (AT89S51 chip in two models, to support the maximum operating frequency of 24MHZ and 33MHZ) in order to have a faster computing speed.

Power Supply: AT89S51 operating voltage range is up to 4-5.5V, while the AT89C51 at the end of the 4.8V and 5.3V.

Anti-jamming more: AT89S51 has integrated watchdog timer (Watchdog Timer), and AT89C51 needs an external watchdog timer circuit, or single-chip software constitute the internal watchdog timer to achieve anti-jamming software.

Cheers

 

[dimas_lilik]

AT89S51 VS AT89C51

Many Thanks to nandhu015 and pranam77. I use the William Eprom programmer.

 

[dimas_lilik]

AT89S51 VS AT89C51

"Anti-jamming more: AT89S51 has integrated watchdog timer (Watchdog Timer), and AT89C51 needs an external watchdog timer circuit, or single-chip software constitute the internal watchdog timer to achieve anti-jamming software."

Pranam77, Sorry I have been using only watchdog timer, but I do not know the real benefits. could provide an explanation.
Thanks

 

[nandhu015]

AT89S51 VS AT89C51

Hai dimas

Look at this links, You will be able to get a clear image about watchdog timers. The micros on these links may be different but the basic is same.

http://en.wikipedia.org/wiki/Watchdog_timer

http://www.netrino.com/Embedded-Systems/How-To/Watchdog-Timer

**broken link removed**

Nandhu

 

[taishandadi]

AT89S51 VS AT89C51

look datasheet。atmel download。