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ST7789H2 Datasheet(PDF) 50 Page - Sitronix Technology Co., Ltd. |
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ST7789H2 Datasheet(HTML) 50 Page - Sitronix Technology Co., Ltd. |
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50 / 314 page  ST7789H2 Version 1.0 Page 50 of 314 2014/01 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. 8.2 8080- Series MCU Parallel Interface Ⅰ Ⅰ Ⅰ Ⅰ The MCU can use one of following interfaces: 11-lines with 8-data parallel interface, 12-lines with 9-data parallel interface, 19-line with 16-data parallel interface or 21-lines with 18-data parallel interface. The chip-select CSX (active low) enables/disables the parallel interface. RESX (active low) is an external reset signal. WRX is the parallel data write enable, RDX is the parallel data read enable and D[17:0] is parallel data bus. The LCD driver reads the data at the rising edge of WRX signal. The D/CX is the data/command flag. When D/CX=’1’, D[17:0] bits is either display data or command parameter. When D/C=’0’, D[17:0] bits is command. The interface functions of 8080-series parallel interface are given in following table. IM3 IM2 IM1 IM0 Interface D/CX RDX WRX Read back selection 0 0 0 0 8-bit parallel 0 1 ↑ Write 8-bit command (D7 to D0) 1 1 ↑ Write 8-bit display data or 8-bit parameter (D7 to D0) 1 ↑ 1 Read 8-bit display data (D7 to D0) 1 ↑ 1 Read 8-bit parameter or status (D7 to D0) 0 0 0 1 16-bit parallel 0 1 ↑ Write 8-bit command (D7 to D0) 1 1 ↑ Write 16-bit display data or 8-bit parameter (D15 to D0) 1 ↑ 1 Read 16-bit display data (D15 to D0) 1 ↑ 1 Read 8-bit parameter or status (D7 to D0) 0 0 1 0 9-bit parallel 0 1 ↑ Write 8-bit command (D7 to D0) 1 1 ↑ Write 9-bit display data or 8-bit parameter (D8 to D0) 1 ↑ 1 Read 9-bit display data (D8 to D0) 1 ↑ 1 Read 8-bit parameter or status (D7 to D0) 0 0 1 1 18-bit parallel 0 1 ↑ Write 8-bit command (D7 to D0) 1 1 ↑ Write 18-bit display data or 8-bit parameter (D17 to D0) 1 ↑ 1 Read 18-bit display data (D17 to D0) 1 ↑ 1 Read 8-bit parameter or status (D7 to D0) Table 10 the function of 8080-series parallel interface 8.2.1 Write cycle sequence The write cycle means that the host writes information (command / data) to the display via the interface. Each write cycle (WRX high-low-high sequence) consists of 3 control signals (DCX, RDX, WRX) and data signals (DB[17:0]). DCX bit is a control signal, which tells if the data is a command or a data. The data signals are the command if the control signal is low (=’0’) and vice versa it is data (=’1’). |
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