HD66773R Datasheet, PDF (73/133 Pages) Renesas Technology Corp – 262,144-color, 132 x 176-dot Graphics Controller Driver for TFT LCD panels

HD66773R
Graphics Operation Function
The HD66773R significantly reduces the load on the graphics-processing software in the microcomputer.
The graphics operation includes:
1. The write data mask function that selectively rewrites some of the 16-bit write data.
2. Logical rewrite function to rewrite data after performing logical operation on the data from the
microcomputer and graphics RAM base data.
3. The conditional rewrite function that compares the write data and the compare bit data and writes
the data sent from the microcomputer only when the conditions are satisfied.
The graphics bit operation is controlled by the setting of bits in the entry mode register and RAM-write-
data mask register, and the write operation from the microcomputer.
Graphics Operation
Bit Setting
Operation Mode I/D AM LG2–0
Operation and Usage
Write mode 1
0/1 0
000
Horizontal data replacement, Draw a horizontal
line
Write mode 2
0/1 1
000
Vertical data replacement, Draw a vertical line
Write mode 3
0/1 0
110 111
Horizontal conditional data replacement,
Draw a horizontal line
Write mode 4
0/1 1
110 111
Vertical conditional data replacement
Draw a vertical line
Read/Write mode 1 0/1 0
001 010 011 Horizontal logical write, Draw a horizontal line
Read/Write mode 2 0/1 1
001 010 011 Vertical logical write, Draw a vertical line
Read/Write mode 3 0/1 0
100 101
Horizontal conditional data replacement,
Draw a horizontal line
Read/Write mode 4 0/1 1
100 101
Vertical conditional data replacement
Draw a vertical line
Note ) In 18-/9-bit interface modes, only write modes 1, 2 are effective. All operations are effective in 16-/8-
bit interface modes.
Rev.1.10, Jun.21.2003, page 73 of 133