ST7735
10.1.22 RAMRD (2Eh): Memory Read
2EH
RAMHD (Memory Read)
Inst / Para
D/CX
WRX
RDX
D17-8
D7
0
D6
0
D5
1
D4
0
D3
1
D2
1
D1
1
D0
0
HEX
RAMHD
0
1
1
1
1
↑
1
1
1
1
1
↑
↑
↑
↑
-
(2Eh)
1st parameter
2nd parameter
∣
-
-
-
-
-
-
-
-
-
D17-8
∣
D7
∣
D7
D6
∣
D6
D5
∣
D5
D4
∣
D4
D3
∣
D3
D2
∣
D2
D1
∣
D1
D0
∣
D0
(N+1)th parameter
D17-8
-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 as
section 9.10
Description
-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.Please check the
LUT in chapter 9.17 when using memory read function.
Status
Default Value
Power On Sequence
S/W Reset
Contents of memory is set randomly
Contents of memory is not cleared
Contents of memory is not cleared
Default
H/W Reset
Flow Chart
V1.7
104
2009-12-04
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
