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How does TTL serial work? - Electrical Engineering Stack Exchange Point of terminology: "TTL serial" is a severely over-broad term, " (point-to-point) asynchronous serial (at TTL levels)" seems to be what you're asking about (Though that's still probably lacking, but at least better)
USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and . . . TTL mean Transistor-Transistor-Logic and has its level for logical zero near 0V and for logical one near 5V Often any 5V logic is called TTL, although most circuits nowadays are built as CMOS Today there are also many circuits that work at 3 3V, which is no longer TTL