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ST7789V2 Datasheet(PDF) 206 Page - Sitronix Technology Co., Ltd. |
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ST7789V2 Datasheet(HTML) 206 Page - Sitronix Technology Co., Ltd. |
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206 / 319 page  ST7789V2 Version 1.0 Page 206 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. 9.1.23 RAMRD (2Eh): Memory Read 2EH RAMRD (Memory Read) Inst / Para D/CX WRX RDX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX RAMRD 0 ↑ 1 - 0 0 1 0 1 1 1 0 (2Eh) 1st parameter 1 1 ↑ - - - - - - - - - 2nd parameter 1 1 ↑ D17-8 D7 D6 D5 D4 D3 D2 D1 D0 1 1 ↑ (N+1)th parameter 1 1 ↑ D17-8 D7 D6 D5 D4 D3 D2 D1 D0 Description -This command is used to transfer data from frame memory to MCU. -When this command is accepted, the column register and the row register are reset to the Start Column/Start Row positions. -The Start Column/Start Row positions are different in accordance with MADCTL setting. -Then D[17:0] is read back from the frame memory and the column register and the row register incremented -Frame Read can be cancelled by sending any other command. -The data color coding is fixed to 18-bit in reading function. Please see section 9.8 “Data color coding” for color coding (18-bit cases), when there is used 8, 9, 16 and 18-bit data lines for image data. Note1: The Command 3Ah should be set to 66h when reading pixel data from frame memory. Restriction Register availability Status Availability Normal Mode On, Idle Mode Off, Sleep Out Yes Normal Mode On, Idle Mode On, Sleep Out Yes Partial Mode On, Idle Mode Off, Sleep Out Yes Partial Mode On, Idle Mode On, Sleep Out Yes Sleep In Yes Default Status Default Value Power On Sequence Contents of memory is set randomly S/W Reset Contents of memory is not cleared H/W Reset Contents of memory is not cleared |
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