8K bytes of program storage space;
512 bytes of data storage space;
2K bytes of EEPROM storage space;
8K bytes of program storage space;
256 bytes of data storage space;
No internal EEPROM storage space;
In addition, the sTC series can be downloaded directly from the serial port to install a driver for the AT series.
STC and AT pins are fully compatible, hardware connection is basically the same, but STC is enhanced, and some features that AT does not have, such as storage capacity RAM size, there are more TImer3 and P4 ports, so STC uses AT The program is no problem, but the AT program with STC may not be normal. For example, I use TImer3 or P4 on STC, and AT does not have these things. How do you think about this? But if the STC program uses something AT, then this program can be used on both chips.
The 89C51 and 89S51 cores are identical, and the 89S51 has several obvious upgrades for the 89C51 as follows;
1. Program memory write mode: The way of writing programs is different. The 89C51 only supports parallel write, and requires VPP to write high voltage. 89S51 supports ISP online programmable writing technology! Serial writing, faster speed, better stability, programming voltage only needs 4 ~ 5V.
2. Power supply range: 89S5* power supply range is 4~5.5V wide, while 89C5* series can't work normally when it is lower than 4.8V and higher than 5.3V.
3. Working frequency: At present, the performance of 89S5* is much higher than 89C5*. The 89S5* series supports the working frequency up to 33MHZ, while the 89C51 operating frequency range only supports up to 24M.
4. Market price: Since 89C51 has been completely discontinued, in terms of market price, the wholesale price of 89C5* in stock is nearly double that of 89S5*!
5. Compatible: 89S5* is backward compatible with 89C5*, which means that 89S5* can be used instead of 89C5*. The same program has the same running result. That is to say, 89S5* is also compatible with all current textbook sample programs.
6. Encryption function : The new encryption algorithm of the 89S5* series makes the decryption of the 89S51 impossible, and the confidentiality of the program is greatly enhanced, so that the intellectual property can be effectively protected from being infringed.
7. Anti-interference: The integrated watchdog timer eliminates the need for an external watchdog timer unit circuit like the 89C51.
8. Longer programming life : 89S5* nominal 1000 times, the actual minimum is 1000 times to 10000 times, which is more favorable for beginners to repeatedly write and reduce the learning cost. Combining some of the above differences, I personally think that the suspension of the 89C51 is only a matter of time, just like the 8031 ​​of the year.
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