HD66773R Datasheet, PDF (70/133 Pages) Renesas Technology Corp – 262,144-color, 132 x 176-dot Graphics Controller Driver for TFT LCD panels

HD66773R
High-Speed RAM Write with Window Address
To rewrite the data in an arbitrary rectangular area of RAM consecutively in high speed, the number of
RAM access should be made 4 multiple times. Accordingly some window-address range may require
dummy write operation to make the RAM access 4 multiple times.
The horizontal window-address range specifying bits (HSA1-0, HEA1-0) specify the number of dummy
write operations executed at the start and end of the data to be written to RAM. The total RAM access
must be 4 multiple times per line.
Number of Dummy Write Operations in High-Speed RAM Write (HSA Bits)
HSA1
0
0
1
1
HSA0
0
1
0
1
Number of Dummy Write Operations to
be Inserted at the Start of a Row
0
1
2 times
3 times
Number of Dummy Write Operations in High-Speed RAM Write (HEA Bits)
HEA1
0
0
1
1
HEA0
0
1
0
1
Number of Dummy Write Operations to
be Inserted at the End of a Row
3 times
2 times
1 time
0
Rev.1.10, Jun.21.2003, page 70 of 133