Introduction: Programmable timer chip It is a convenient and flexible timing circuit that combines software and hardware. It plays an extremely important role in timing control. In microcomputer control systems, timing interruption, timing detection, timing scanning, etc. are commonly used. In real-time operating systems and multitask operating systems, process scheduling should be carried out regularly. The daily clock timing, DRAM refresh timing and speaker Tone control adopts timing control technology. Low power timer chip: used to control the power supply of 2G module, power on when the time comes, 2G module sends signals, and the chip turns off the power supply. The power consumption must be UA level, and it can be timed for more than 1 day, similar to MCU+RTC function. Digital clock chip: There are many types of digital clock chips, such as the three wire DS1302, I2C bus PCF8563, etc. Among them, DS1302 is cheap and easy to purchase, which is very suitable for DIY.
