1、Serial ports and COM ports refer to the physical interface form (hardware). TTL, RS-232, and RS-485 refer to the level standards (electrical signals). 2、When connecting devices, generally only GND, RX, and TX are connected. The Vcc or +3.3V power line is not connected to avoid conflicts with the power supply of the target device. 3、The … Read more
1. The serial port and COM port refer to the physical interface form (hardware). TTL, RS-232, and RS-485 refer to the level standards (electrical signals). 2. When connecting devices, usually only GND, RX, and TX are connected. Vcc or +3.3V power lines are generally not connected to avoid conflicts with the power supply of the … Read more
1) STC89C52 The STC89C52 microcontroller is a model from the STC89 series of microcontrollers. The STC89 series microcontrollers are a new generation of high-speed/low-power/highly anti-interference microcontrollers launched by Holtek Technology. The instruction code is fully compatible with traditional 8051 microcontrollers, and 12 clock/machine cycles and 6 clock/machine cycles can be selected arbitrarily. The HD version … Read more
Recently, I needed to use the 51 microcontroller for some control tasks in a project. The main function is to receive commands from the host computer through the serial port, analyze and decode them, and wait for an external trigger signal to execute the previously received command actions. Fortunately, I had an STC89C52 on hand, … Read more
Every semiconductor company has one or two star products during its development. These products help the company gain fame and establish a solid position in the semiconductor market. In the history of Maxim Integrated, there is such a star product that helped the company achieve profitability in its first year and successfully IPO in 1988! … Read more