What is the difference between UART and TTL serial?

The difference between UART and TTL serial is as follows:

• Definition: UART is a hardware device or module used for asynchronous serial communication.
• Function: Responsible for the transmission and reception of serial data. It converts parallel data into serial data and converts serial data back to parallel data at the receiving end.
• Level standard: UART itself does not specify the voltage level standard, it can use different level standards such as TTL, RS-232, etc.
• Application: Commonly used for communication between microcontrollers, computers and other devices.

• Definition: TTL serial is a serial communication method that uses the TTL (transistor-transistor logic) level standard.
• Level standard:

High level (logic 1): usually 3.3V or 5V.
Low level (logic 0): usually 0V.

• Interface form: usually includes pins such as TXD (transmit data), RXD (receive data), GND (ground) and VCC (power supply).
• Application: Widely used in embedded systems, development boards (such as Arduino, Raspberry Pi) and other devices that require low voltage logic levels.

• Different levels: UART is a hardware module or device, while TTL serial is a level standard. UART can communicate using the TTL level standard, but it can also use other level standards.
• Different uses: UART is used to handle the protocol and process of serial data transmission, while TTL serial only defines the voltage level in data transmission.
• In general, UART and TTL serial are usually used together, and UART modules can communicate through TTL levels.

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