• At89s51 Datasheet

My, my, I thought you'd never ask. There's a large number to choose from, so I'll give you a rundown of the most popular ones.
• The USBasp is quite possibly the cheapest programmer out there, but you should be careful when buying them; some versions use outdated firmware or are missing jumpers. Make sure that your model has three jumpers (or three pairs of holes with J1, J2, and J3 printed next to them). You can find them on eBay starting at only $3. Be wary of the shipping times that the Chinese ones come with.
• A parallel port programmer is around the same price and can even be made at home. It, obviously, will only work on computers with a parallel port.
• The USBTinyISP is a step up from the USBasp. It costs $22 from Ladyada, but knockoffs can be had from eBay for around $12. Keep in mind that it cannot program certain high end Atmega devices due to memory limitations.
• The AVRISP mk.II is Atmel's official programmer for the AVR line of chips. It is without a doubt the most powerful of these programmers and can be used with AVR Studio (complete with debugger!), but costs around $35 to get.
Your programmer might come with either a 10 pin connector or a 6 pin connector. The only difference between the two is that the 10 pin connector has 4 redundant/unused pins.
Due to my aforementioned lack of money, my programmer was a USBasp. Once again, make sure you get one with all three jumpers; mine looks nice and comes with a fancy case, but is missing 2 of them. Thankfully, it still works.

At89s51 Datasheet

Tags: At89s51-24ju 8-bit Microcontroller At89s51 Micro Chip AT89S51 8-bit Microcontroller Programmable IC Chip AT89S51 -24AU MCU 4K ISP FLASH 2.7 TO 5.5V 24MHz 44-TQFP US $ 0.67 - 0.98. AT89C51 - 8 bit Microcontroller with 4k Byte Flash. International Shipping starts from 13 USD: DHL / Fedex (3-7 days priority delivery).