8031 and 8051 are the most common mcs51 series MCUs. They are the mature MCU products of Inter Company. The application scope covers all walks of life. The following is a description of its pin maps.
8031, 8051 pin diagram
8031, 8051 pin function
(1) Main power supply pins Vss and Vcc
1 Vss ground
2 Vcc is +5 volt power supply during normal operation
(2) External crystal oscillator pins XTAL1 and XTAL2
1 XTAL1 internal oscillator circuit The input of the inverting amplifier is a pin of the external crystal. This pin is grounded when an external oscillator is used.
2 XTAL2 internal oscillator circuit output of the inverting amplifier. It is the other end of the external crystal. When an external oscillator is used, this pin is connected to an external oscillator source.
(3) Control or multiplex pins RST/VPD, ALE/, and /Vpp with other power supplies
1 RST/VPD A two-cycle high (low-to-high transition) on this pin when the oscillator is running will reset the microcontroller
During Vcc power-down, this pin can be connected to the backup power supply, and the VPD provides internal backup power to maintain the data in the internal RAM.
2 ALE/ For normal operation, the ALE function (Allow Address Latch) is provided to latch the low byte of the address to the external latch, and the ALE pin periodically emits a positive pulse at a constant frequency (of the oscillator frequency). signal. Therefore, it can be used as a clock for external output or for timing purposes. Note, however, that whenever an external data memory is accessed, an ALE pulse is skipped and the ALE terminal can drive (sink or output current) eight LSTTL circuits. For EPROM type microcontrollers, this pin receives the programming pulse (function) during EPROM programming.
3 The external program memory read strobe signal output is valid twice during each machine cycle while fetching instructions (or data) from an external program. It is also possible to drive eight LSTTL inputs.
4 /Vpp , /Vpp are internal program memory and external program memory selection. When /Vpp is high, the internal program memory is accessed, and when /Vpp is low, the external program memory is accessed.
For EPROM type microcontrollers, a 21 volt EPROM programming power supply (Vpp) is added to this pin during EPROM programming.
No.: 00111 material: Aluminum specification: 0-5m optional model: uqk-01l the principle of electronic liquid level switch is to detect the liquid level through the electronic probe, and then process the detected signal through the special liquid chip for level detection When the measured liquid reaches the action point, the chip outputs high-level or low-level signal, and then cooperates with the water level controller to control the liquid level No floating ball and reed, no external mechanical action, pollution resistance and durability, not afraid of the influence of floating objects It can be installed at any angle The vertical installation has certain anti - wave function and is suitable for immersion in water for a long time The working voltage is DC 5-24v, which is very safe This method is practical,
Level Measuring Controller,Magnetic Control Liquid Level Switch,Liquid Level Control Switch Module,Liquid Level Control Stainless Float Ball
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