130
Bits 5 and 4—DMA Mode (DMA1, DMA0): These bits specify DMA transfer. Use the
DMA flag (DMF) in SR to check for the start and end of DMA mode.
Bit 5:
D M A 1
Bit 4:
DMA0
Description
0
0
Normal mode is set.
(Initial value)
1
The mode for DMA transfer to memory (UGM) corresponding to
CS0
is
set. When the remaining DMA transfer count reaches 0, this bit is
automatically cleared and normal mode is entered. The initial value of the
remaining DMA transfer count is determined by the setting in the DMA
transfer word count register (DMAWR). The remaining DMA transfer count
is an internal value in the LSI, and is decremented by 1 each time a word
is processed.
UGM access by the CPU is disabled in this mode.
1
0
Setting prohibited
1
The mode for DMA transfer to the register [image data entry register
(IDER)] corresponding to
CS1
is set. In this mode, register address
incrementing is not performed and all writes are to IDER. When the
remaining DMA transfer count reaches 0, this bit is automatically cleared
and normal mode is entered. The initial value of the remaining DMA
transfer count is determined by the setting in the DMA transfer word
count register (DMAWR). The remaining DMA transfer count is an LSI
internal value, and is decremented by 1 each time a word is processed.
UGM access by the CPU is disabled in this mode.
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 ...
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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 ...