This article mainly introduces the 74hc573 application case based on 51 single-chip microcomputer, I hope it can help you. Before introducing the 74hc573 application case, we must first know what 74hc573 is, which means what is the latch? Data latching means that when the input data disappears, the data remains at the output end of the chip. As shown in the figure below, the functions of the pins of the chip are as follows: The figure on the right hides the two pins VCC (connected to +5V power supply) and GND (ground). OE: output_enable, output enable; LE: latch_enable, data latch enable, latch means latch; Dn: The nth data input terminal; (D means Data input) Qn: The nth data output terminal; When OE=1, no matter what Dn or LE is, the output terminal is in a high impedance state; When OE=0, LE=1, the output data is equal to the input data, and the chip can be regarded as non-existent, which is equivalent to a wire; When OE=0 and LE=0, the output terminal remains unchanged and is in the data latch state; This is done in actual application: a. Let OE=0; LE=1 b. Output the data from the port line of the microcontroller to Dn; c. Let OE=0; LE=0; d. At this time, the data you need to output is locked on Qn, and changes in the input data will not affect the output data. As shown in the figure below, two 74HC573 latches are connected to the P3 port at the same time, the output enable terminals OE of the two chips are grounded, and the data latch enable terminal LE is connected to P2^6 and P2^7 respectively. The latch The output data terminal Qn is connected to the LED bar display. In this example, the upper four LED lights of U4 are lit and the lower four LED lights of U5 are lit by assigning different values ​​to the P3 port. In fact, there are many application circuits for 74hc573. This article just selects a relatively simple application circuit, and I won’t repeat them here. Portable Projector With Battery The so-called Portable Projector, also known as pocket projector, mainly through the 3M LCOS RGB three-color projector and decoding technology, the traditional huge projector is refined and portable, making the projection technology closer to life and entertainment. A portable projector with a battery is a projector that does not need to be charged. Portable Projectors With Battery,Best Portable Mini Home Projector 2022,Battery Powered Mini Projector,Portable Projector with Built-in Battery,Best Budget Projectors with Built-in Battery Shenzhen Happybate Trading Co.,LTD , https://www.happybateprojector.com
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