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ST7789V2 Datasheet(PDF) 55 Page - Sitronix Technology Co., Ltd. |
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ST7789V2 Datasheet(HTML) 55 Page - Sitronix Technology Co., Ltd. |
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55 / 319 page  ST7789V2 Version 1.0 Page 55 of 319 2016/11 Sitronix Confidential The information contained herein is the exclusive property of Sitronix and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of Sitronix. 8.4 Serial Interface IM3 IM2 IM1 IM0 Interface Read back selection 0 1 0 1 3-line serial interface Ⅰ Via the read instruction (8-bit, 24-bit and 32-bit read parameter) 0 1 1 0 4-line serial interface Ⅰ 1 1 0 1 3-line serial interface Ⅱ 1 1 1 0 4-line serial interface Ⅱ Table 13 Selection of serial interface The serial interface is either 3-lines/9-bits or 4-lines/8-bits bi-directional interface for communication between the micro controller and the LCD driver. The 3-lines serial interface use: CSX (chip enable), SCL (serial clock) and SDA (serial data input/output), and the 4-lines serial interface use: CSX (chip enable), D/CX (data/ command flag), SCL (serial clock) and SDA (serial data input/output). Serial clock (SCL) is used for interface with MCU only, so it can be stopped when no communication is necessary. 8.4.1 Pin description 3-line serial interface Ⅰ Pin Name Description CSX Chip selection signal DCX Clock signal SDA Serial input/output data 4-line serial interface Ⅰ Pin Name Description CSX Chip selection signal WRX Data is regarded as a command when WRX is low Data is regarded as a parameter or data when WRX is high DCX Clock signal SDA Serial input/output data 3-line serial interface Ⅱ Pin Name Description CSX Chip selection signal DCX Clock signal SDA Serial input data SDO Serial output data 4-line serial interface Ⅱ Pin Name Description CSX Chip selection signal WRX Data is regarded as a command when WRX is low Data is regarded as a parameter or data when WRX is high |
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