Custom Negative Segment VATN LCD Display With HT1621 ST7035 Controller

HT1621 Controller Segment LCD Display Module, Customize Segment LCD Display With Backlight

Let's take a look at the characteristics of the 1621-segment LCD screen
* Operating voltage 2.4 --5.2V * Embedded 256KHz RC oscillator
* External 32KHz chip or 256KHz frequency source input can be connected
* Selectable 1/2bais or 1/3bais bias and duty cycle of 1/2duty, 1/3duty, 1/4duty
* On-chip time-base frequency source
* The buzzer can be selected with two frequencies
* Built-in timebase generator and watchdog timer WDT
* Timebase or watchdog timer overflow output
* Eight time-base/watchdog timer clock sources
* One 32segX 4com LCD driver with embedded 32X 4-bit display RAM memory
* Four-wire serial interface /CS, DATA, WR, RD, generally not used by RD
* The on-chip LCD drive frequency is not adjustable at 64HZ
* Software configuration features: data mode and command mode two commands
* VLCD pins are provided for adjusting the LCD operating voltage (contrast adjustment)

LCD logical table correspondence

The RAM of HT1621 corresponds to the logical table in the figure above. This is a good understand,

HT1621 corresponds to 32 addresses, and each address corresponds to 4 COM data
For example, if a 0 address is written to 0X08 T1 of SGE0 is lit 
Write 0X01 corresponds to the 1F light of SGE0
Write 0X02 1G brightness corresponding to SGE0
Write 0X07 1E, 1G, and 1F of SGE0 are lit together
Write 0X0F All 1E, 1G, 1F, and T1 of SGE0 are bright

HT1621 can be written consecutively, and it is best to write two addresses at a time, so that it is easy to make a table table, and it is easy to write.
For example, the first two addresses are written 0XF7 corresponding to SGE0, SEG1, 1E, 1G, 1F, 1D, 1C, 1B, and 1A are all lit, so that a full "8" character is displayed.

In order to make the LCD display, these instructions must be written in the initialization of the IC.

First, let's understand what instructions are and what data is
1 0 0   C8 C7 C6 C5 C4 C3 C2 C1 C0
The first three digits of 100 are the flag bits of the instruction, and the last 9 bits are the instruction values
1 0 1   C7 C6 C5 C4 C3 C2 C1 C0
The first three digits 101 are the flag bits of the data, and the last 8 bits are the data
That is, seeing the first three digits of 100 represents the instruction, and seeing the first three digits of 101 represents the data

Custom Negative Segment VATN LCD Display With HT1621 ST7035 Controller​ Product Images

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