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Selecting 83C154 (8051) replacement

zelbi

Hello. I have a project from 1990's with a 83C154  microcontroller (8051).

Can somebody suggest a replacement popular 8051 derivative, good tools and long availability? The whole project was written in assembler with BSO/tasking assembler and tools. So minimal uC layout changes are preferred due to the assembly nature of the project. 

Thanks :-)

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  • 0

    the pinout seems to be identical with 8051 - the question is which of 83c154 differences/improvements are in use?

    And why 83? Was it using internal, factory-programmed ROM or external program memory was used? What is the size of the code?

    If it is using external EPROM, the question is why no other 8x52 can be used? Is very high clock speed needed?

    The list of differences seems rather short - according to this https://www.keil.com/dd/docs/datashts/atmel/c51_ao.pdf

    difference between 8xc52 and 8xc154 amounts to:

    • timers include watchdog and 32bit timer/counter
    • serial reception error detection
    • new modes for power reduction
    • programmable impedance port
    • asynchronous counter/serial port mode during power-down
    • 16KB of internal ROM

    AT89S52 from Microchip is advertised to be in production and a successor of 89C52 (clocked up to 33MHz)

    89S52 in DIP40 at Farnell portal

  • 0 in reply to JWx

    I am not planning to do any upgrade/development. Just use the existing code as is, with zero changes, if possible, It has 16K of ROM, which is sufficient. 

    But I would like to use modern tools like IAR, Keil IDE etc. Do the newer 8051 derivatives have debugger (Jtag) support?

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  • 0 in reply to zelbi

    So it seems that it is large-scale production if MCU with your code in ROM (factory prepared read only memory) were bought from the manufacturer - if you need many thousands of these maybe some manufacturer is going to prepare a batch of them for you (especially when you still have specs from previous manufacturing runs)?

    BTW - you cannot buy them from the market if you expect your code to be present in ROM.

    What package is used in your project?

    There seems to be a piggyback version: M85C154 (but with unknown availability) in DIP40 - where you can attach EPROM emulator on top of the MCU to make development easier, but I don't think that any "classic" 8051 has any debug interface present - only ISP (maybe those newer families have something but they would require some daughterboard - as has mentioned - to be installed in place of original part)

    BTW - 89S52 is 8KB Flash only - I was assuming that your project is using external EPROM (only rarely one encounters a project of the scale that can afford preparing a dedicated ROM version - especially from the times when ROM was not programmed but etched in silicon with the rest of MCU) - 16KB seems to be present only in newer '51 families (along with USB/ADC/... options and even debug interfaces, but also with modern SMD packages)