No, we were talking about the TG-16, not the Genesis. No 68000s involved. Or Z80s for that matter.
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from wiki. the game decided the cpu speed.
CPU: 8-bit HuC6280A, a modified 65C02 running at 1.79 or 7.16 MHz (switchable by software). Features integrated bankswitching hardware (driving a 21-bit external address bus from a 6502-compatible 16-bit address bus), an integrated general-purpose I/O port, a timer, block transfer instructions, and dedicated move instructions for communicating with the HuC6270A VDC.