[linguistiliniw]

IIRC MSP430 microcontrollers do something like that, too. They have low-power 16-bit CPUs, but you can't do a lot with 64k memory space so newer models have instructions with 20-bit addressing.

They're fun to work with; some versions have FRAM instead of Flash memory.

[wildzzz]

FRAM is pretty neat. I considered using an MSP430FR5969-SP for a component on a satellite but backed off when I learned more about the destructive read process. We were concerned about a transient bitflip during the write back and had no where safe to store program code other than the FRAM itself. Instead, we went with a RISC-V core in an FPGA and used an 8 channel ADC to cover the telemetry reporting the MSP430 was supposed to handle. I spent a lot of time writing fast, safe code for it so was a little disappointed it never made it into the final design.