The Zilog one might be stopping, but the Toshiba and Sharp units are likely to stay in production for a good number of years still, as they also have all the peripherals of the Z80 family inside the package, and thus you can make a complete SOC with them, as they all now have 32k of RAM and 32k of flash built in, though there are still a fair number made with older OTP Eprom memory, which is in a lot of industrial equipment, copiers and such, along with lots of other applications where they have a very long code base life, and are familiar with the design.
Yup, the
process FAB that makes Zilog's CMOS version of the NMOS Z80, is being terminated. The NMOS Z80 is long gone.
Zilog still have other CMOS process Z80 variants, as do other companies.
Just like intel no longer publicly sells stand alone 8051, there are many companies making new-process 80C51 variants.
The original 8051 has 8 bit opcode fetch, and 12 clocks per opcode.
The newest 80C51's can fetch 24 bits of opcode in a single clock cycle, and run at 45Mhz +
The 80C51 is the most widely sourced 8 bit MCU on the planet.
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It is worth understanding why they make those points.
https://www.eleshop.nl/rohde-schwarz-rtb2004-oscilloscoop.html?gad_source=1&gclid=CjwKCAjwuJ2xBhA3EiwAMVjkVIkTxkxw-RRv1b-6FZMK4SPThHQuZIQDMGKAdpAg6m9gnVzIk4lLdxoCP54QAvD_BwE
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