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6 . 3
Notes on Data Transfer in YUV Mode
1. If data transfer is performed continuously by CPU access when a YUV mode setting of 10 (
∆
YUV-RGB conversion) is used, provide for an interval of 36 CLK0 cycles or more to be left
immediately before transferring the last data of each raster.
2. If data transfer is performed continuously by CPU access when a YUV mode setting of 01
(YUV-RGB conversion) is used, leave an interval of 36 CLK0 cycles or more at the start of a
line, and then when data is set in the image data entry setting register, perform a dummy read of
the Q2’s status register only after setting odd-numbered data. The figure 6-3 shows the transfer
procedure for one line.
1st
setting
Wait of 36
CLK0 or more
2nd
setting
3rd
setting
4th
setting
5th
setting
Dummy
read
Dummy
read
Dummy
read
Figure 6-3 Data Transfer Procedure for One Line
3. When YUV mode = 01 or 10 , do not perform reads of the registers shown in the table below.
A [ 1 0 : 1 ]
Register Abbreviation
Register Name
007
IEMR
Input data conversion mode
010
DMASHR
DMA transfer start address
011
DMASLR
DMA transfer start address
012
DMAWR
DMA transfer word count
021
ISAHR
Image data transfer start address
022
ISALR
Image data transfer start address
023
IDSXR
Image data size
024
IDSYR
Image data size
025
IDER
Image data entry
026–0FF
—
Reserved
4. When YUV mode = 01 and DMA mode = 11, data transfer to the Q2 cannot be performed by
the DMA controller.
6 . 4
Software Reset Bit
If the software reset bit (bit 15) in the system control register is set to 1 when the Q2 is
performing drawing operations, the display address may cease to be updated. Therefore, the software
Summary of Contents for HD64411 Q2
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Page 108: ...101 Example 0 0 Work coordinates Rendering coordinates XC YC ...
Page 110: ...103 Example Old XC YC Old XC XC old YC YC 0 0 Work coordinates Rendering coordinates XC YC ...
Page 116: ...109 Example 0 0 Work coordinates Rendering coordinates XMIN YMIN XMAX YMAX ...
Page 118: ...111 Example 0 0 Work coordinates Rendering coordinates XMAX YMAX ...
Page 120: ...113 Example 0 0 Work coordinates XMIN YMIN XMAX YMAX ...
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