Functional description STL215 is an 8-bit FLASH structure microcontroller with built-in 68K bytes of FLASH program space and 1.5K bytes of data space. 36 bidirectional IO ports can be directly connected to 3.3V and 5V systems. Only SCL and SDA can be used to download programs and debug on the board. Built-in 32K space with power-off memory, no need to add 24C01 or similar chips to complete the memory function. Built-in watchdog independently operated by RC oscillation, even in the case of large interference, more stable operation can be achieved. Built-in power-off reset circuit, when the voltage is lower than 15% of the rated voltage, the system is reset, and all IOs are high after reset. All IO ports are high when powered on, pulled up by the pull-up resistor inside STL215. The RST reset pin can be reset by a reset IC or by using a RC reset composed of a resistor and a capacitor to reduce costs. The range of crystal oscillator can be from 4MHz to 33MHz, and only a crystal oscillator and a capacitor are needed to achieve oscillation, reducing costs and simplifying the circuit. PD7 to PD0 do not have built-in pull-up resistors. When used, they can be grounded or have pull-up resistors added for control purposes. PB2 has a remote control input port with built-in dedicated receiving hardware, which has stronger error correction capabilities and can be used as a normal IO in situations where remote control input is not used. Using the AR5 upgrader dedicated to Longzhu Technology, programs can be downloaded and debugged from SCL and SDA. SCL and SDA can be connected to other standard I2C devices. In applications with I2C, programs can be downloaded and debugged without the need for additional resources. With the WriteAR5.exe file, program files can be upgraded over the network, making software replacement and upgrades quick and easy.
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