11 common circuit design modules of single-chip microcomputer, very useful knowledge!

MCU chip decryption and cracking method

How do single-chip microcomputers and digital circuits resist interference?

(Click the red letter above to get it)

Two-way 232 communication circuit

The 3-wire connection method corresponds to the female connector, the working voltage is 5V, and MAX202 or MAX232 can be used.

Transistor serial communication

This circuit is built with triodes, the circuit is simple and the cost is low, but the problem is that it is generally very good at low baud rates.

Single 232 communication circuit

The three-wire method is completely equivalent to the above three-stage pipe.

USB

The PL2303HX is used, which is cheap and has good stability.

SP706S reset circuit

With watchdog and manual reset, the price is cheap (Maxin's is much more expensive), R4 is used for debugging, after debugging, solder R4.

SD card module circuit (with lock)

This circuit is related to the package of the SD card, please note that it corresponds to the package. This circuit can control the power supply of the SD card through the port, which is relatively complete and can be used for 5V and 3.3V. However, it should be noted that the use of some devices, 5V and 3.3 are not the same.

LCM12864 Liquid Crystal Module (ST7920)

This circuit is a common 12864 circuit, which is cheap and has a Chinese character library. It can be set to work in serial mode or parallel mode through the level of the PSB port, with backlight control function.

LCD1602 Character LCD Module (KS0066)

The most commonly used character LCD module, which can only display numbers and characters, can be controlled by 4 or 8 digits, and has a backlight function.

Full-duplex RS485 circuit (with protection function)

With protection function, full-duplex 4-wire communication mode, suitable for long-distance communication.

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RS485 half-duplex communication module

The data transmission direction can be selected by selecting the port, with protection power. This module can only work at 5V.

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ARM JTAG emulation interface circuit

It is relatively complete and can be applied to conventional ARM chips with automatic download function, which can be used with JLINK or ULINK.

Source: Internet

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11 common circuit design modules of single-chip microcomputer, very useful knowledge!

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