Which 68HC11 version?

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Which 68HC11 version?

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meterman1980
Contributor I

Some time ago, I posted a question asking about the Motorola SC44125P CPU, and I eventually determined that it is a custom 6800 with pre-programmed, dedicated data bus (8 bit) and address bus (16 bit) pins, along with the 6801 instruction set. Although it has the option, neither the on-board RAM or ROM are used.

After some brief comparison of later 68xx CPUs, I see the 68HC11 comes closest, but want to know which would be a suitable version (or newer replacement) that would work the best.

Requirements:

6801 or 68HC11 instruction set
Ability to disable on-board RAM / ROM
Dedicated 16-bit address bus pins or the ability to easily program same
Dedicated 8-bit data bus pins or ability to program same
Support pins required: R/~W, Clock input (1MHz), ~IRQ, ~IRQ2, ~NMI, and ~Reset

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vicentegomez
NXP TechSupport
NXP TechSupport

Sorry all the HC11 is obsoleted 

 

So I can not recommend you any HC11 device.

 

If you want you can move to the S08 family like the mc9s08pb family

https://www.nxp.com/products/processors-and-microcontrollers/additional-mpu-mcus-architectures/8-bit...

 

I hope this will help you

 

 

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meterman1980
Contributor I

Does it use the same opcodes as the MC6801?

I'm hoping to see if there's anything I can use without having to rewrite 16K of densely written assembly.

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vicentegomez
NXP TechSupport
NXP TechSupport

No, sorry, it does not use the same opcodes 

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