Cytron Technical Forum

After Microchip acquisition of SST, the company has continue manufacturing these 8051 microcontrollers by the purchased company.

Anyone who is working on 8051 will feel comfortable with the newer 8051 microcontrollers by Microchip.

http://www.microchip.com/pagehandler/en-us/family/8051legacy/

Unless the 8051 produced by microchip has flash memories and able to program using ICSP, it would be better to use the Atmel 89Sxx series of chips. If one can get the 87C51 eprom based 8051. The 8051 needs external rom and ram which makes the circuit more complicated and it is more or less like a MPU with I/O.

Actually I prefer the Motorola mcu MC68HC908JB8, take a look at the page here:

Fun with HC08
http://www.sparetimelabs.com/funwith08/funwith08.html

Allen

ABSF WROTE:Unless the 8051 produced by microchip has flash memories and able to program using ICSP, it would be better to use the Atmel 89Sxx series of chips. If one can get the 87C51 eprom based 8051. The 8051 needs external rom and ram which makes the circuit more complicated and it is more or less like a MPU with I/O.

Actually I prefer the Motorola mcu MC68HC908JB8, take a look at the page here:

Fun with HC08
http://www.sparetimelabs.com/funwith08/funwith08.html

Allen

I believe they have program memory for these Microchip's 8051. However, there is not much support on the 8051 by Microchip due to the recent purchase, and I believe there are not much plans for them to introduce the 8051 to the customers since they offers a lot of PIC microcontrollers.

Thanks for the link - the 68HC08 is still sold? I thought they are already Freescales later.

Isn't Freescales a subsidiary of Motorola? All the chip manufacturing jobs are transferred to Freescales and Motorola would concentrate on the Mobile phones, communications and automobile electronics plus other business. I always use the Freescales and Motorola interchangeably.

Just like the 68HC11, it normally came with an 8K OTP eprom inside. My HC11 SBC from NMI came with the monitor program built in. You can also opt for "FORTH" or "BASIC" interpreter before shipping. But the internal ROM can be disabled to use the eprom outside so I have BASIC in external Eprom and Monitor program internally. Later Motorola came out with 68HC811 and 68HC911 series but it was too late as the market has moved to PIC and AVR. The HC811 is eeprom based and HC911 is flash based. Both can be erased and programmed externally.

Allen

Brian, thanks for the update