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ST7787 Datasheet(PDF) 141 Page - Sitronix Technology Co., Ltd. |
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ST7787 Datasheet(HTML) 141 Page - Sitronix Technology Co., Ltd. |
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141 / 217 page  ST7787 Ver. 1.7 2008.04.18 141 10.1.23 RAMRD (2Eh): Memory Read 2Eh RAMRD (Memory Read) Inst / Para D/CX WRX RDX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 (Code) RAMRD 0 ↑ 1 - 0 0 1 0 1 1 1 0 (2Eh) 1 st Parameter 1 1 ↑ - - - - - - - - - - 2 nd 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 - NOTE: “-” Don’t care, can be set to VDDI or DGND level Description -This command is used to transfer data from frame memory to MCU. -This command makes no change to the other driver status. -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. (See section 9.12) -Then D[23:0] is read back from the frame memory and the column register and the row register incremented as section 9.10.2. -Frame Read can be canceled by sending any other command. -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. Restriction -In all color modes, the Frame Read is always 18- bits and there is no restriction on length of parameters. -Memory read is only possible via the SPI and parallel interface 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 Flow Chart RAMRD (2Eh) Legend Dummy Read Image Data D1[17:0],D2[17:0]…Dn[17:0] Command Parameter Display Action Mode Any Command Sequential |
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