ST7781
11. Register Descriptions
ST7781 adopts 18-bit bus interface architecture for high-performance microprocessor. All the functional Blocks of ST7781
starts to work after receiving the correct instruction from the external microprocessor by the 18-, 16-, 9-, 8-bit interface. The
index register (IR) stores the register address to which the instructions and Display data will be written. The register
selection signal (RS), the read/write signals (/RD//WR) and data bus DB[17:0] are used to read/write the instructions and
data of ST7781. The registers of the ST7781 are categorized into the following groups.
1. Specify the index of register (IR)
2. Read a status
3. Display control
4. Power management Control
5. Graphics data processing
6. Set internal DRAM address (AC)
7. Transfer data to/from the internal DRAM (R22)
8. Internal grayscale γ-correction (R30 ~ R3D)
Normally, the display data (DRAM) is most often updated, and in order since the ST7781 can update internal DRAM
address automatically as it writes data to the internal DRAM and minimize data transfer by using the window address
function, there are fewer loads on the program in the microprocessor. The way of assigning data to the 16 register bits (
DB [15:0]) varies for each interface. Send registers in accordance with the following data transfer format.
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