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Even field
Odd field
HSYNC
Display area
Display area
External update interval
External update interval
VBK and FRM flags
both set to 1
Only VBK flag
set to 1
VSYNC
Figure 5-1 (b) External Update Interval (Interlace Mode and Interlace Sync &
Video Mode)
Internal Updating: Some address-mapped registers have an internal update function. The
internal update function is provided to prevent display flicker when the CPU modifies address-
mapped registers relating to display operations without being aware of the display timing.
The display controller references address-mapped registers in coordination with display timing, and
latches data in an internal register. This data transfer is called internal updating. Internal updating is
carried out while the DRES is set to 1 in the system control register (SYSR) and at the beginning
of each frame. The update is performed on setting of the fall of
VSYNC
when TVM1 = 0 and
TVM0 = 0 in the display mode register (DSMR) (master mode), and on detection of the fall of
EXVSYNC
when TVM1 = 1 and TVM0 = 0 (TV mode). Internal updating is not performed when
TVM1 = 0 and TVM0 = 1.
The address-mapped registers provided with the internal update function are shown in tables 5-7 (a)
and (b). The initial values of these registers should be set while the DRES bit is set to 1.
However, internal updating is performed for display start address 0 and display start address 1 in
display operations. In drawing operations, external updating is used.
Содержание HD64411 Q2
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Страница 108: ...101 Example 0 0 Work coordinates Rendering coordinates XC YC ...
Страница 110: ...103 Example Old XC YC Old XC XC old YC YC 0 0 Work coordinates Rendering coordinates XC YC ...
Страница 112: ...105 Example 0 0 Work coordinates Rendering coordinates XO1 YO1 XO1 DX2 YO1 DY2 XO1 DX1 YO1 DY1 LINE ...
Страница 116: ...109 Example 0 0 Work coordinates Rendering coordinates XMIN YMIN XMAX YMAX ...
Страница 118: ...111 Example 0 0 Work coordinates Rendering coordinates XMAX YMAX ...
Страница 120: ...113 Example 0 0 Work coordinates XMIN YMIN XMAX YMAX ...
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Страница 213: ...206 Figure 7 20 TV Sync Mode Display Timing When DOT 0 or DOT 1 and EXHSYNC cycle is even multiple of CLK1 cycle ...