If you want something friendly and CISC-y and modern, check out the Renesas RX600 and friends. They have a nice instruction set and zero-wait-state RAM and ROM,

If you want something friendly and CISC-y and modern, check out the Renesas RX600 and friends. They have a nice instruction set and zero-wait-state RAM and ROM, so writing assembly by hand with predictable timing ought to be easy. https://www.renesas.com/en-us/doc/products/mpumcu/doc/rx_family/r01us0032ej0120_rxsm.pdf https://www.renesas.com/en-us/doc/products/mpumcu/doc/rx_fam...