Share the common problems of MSP430: LCD display driver

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Share the common problems of MSP430: LCD display driver [Copy link]

Q1: Crystals are usually connected to 32768, and it is normal to use LCD. I plan to connect the crystal to 6M to replace 32768, will the LCD still display normally?
A1: See what the timing limit of the LCM module you are using is, and then see if the program time exceeds this limit frequency when the MSP430 drives the LCM under 6M conditions. If it exceeds, a delay must be added.

Q2: How can I/O drive LCD directly?
A2: It is recommended to use a chip with LCD driver. You can use the MSP430F4xx series chip. If you don't use a chip with LCD driver, you can use the IO port to simulate the LCD waveform. It is more complicated, but it can be done. You can download the application report about LCD on the TI website.

Q3: What are the differences between segment LCD and dot matrix LCD and their different applications?
A3: Segment LCD displays less information, but is cheap and has a simple driving circuit. Dot matrix LCD can display rich information and can display Chinese characters and pictures, but is more expensive, has a more complex driving circuit, and the driver is also much more complex than the driver of segment LCD.

Q4: Use CMOS series chips to drive LED digital tubes, and perform static driving of LED digital tubes, but I don’t know which CMOS chip to use. What is a good method?
A4: CD4094 or HC4094 chips, 74LS245/74hc245/74hc373 can also be used. There are many optional chips. I think CD4094 is OK, but the cost is relatively high. It is recommended to use a boost power management chip + an ordinary shift register to achieve it. CAT4238+74HC164 can be used to achieve it. Like 74hc373, these can all be used. One digital tube can be static; 2 74hc373 chips can drive 8 LED digital tubes in scanning mode.