HD66760 Datasheet, PDF (35/105 Pages) Hitachi Semiconductor – 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors

HD66760
Table 27 GRAM Data and Grayscale Palette in the Four-grayscale Mode (GS = 1)
GRAM Data
Setting
C1 C0
0
0
0
1
1
0
1
1
<R> Grayscale Palette
<G> Grayscale Palette
RK03 RK02 RK01 RK00 GK03 GK02 GK01 GK00
RK13 RK12 RK11 RK10 GK13 GK12 GK11 GK10
RK23 RK22 RK21 RK20 GK23 GK22 GK21 GK20
RK33 RK32 RK31 RK30 GK33 GK32 GK31 GK30
<B> Grayscale Palette
BK03 BK02 BK01 BK00
BK13 BK12 BK11 BK10
BK23 BK22 BK21 BK20
BK33 BK32 BK31 BK30
Read Data from GRAM (R22h)
RD15–0: Read 16-bit data from the GRAM. When the data is read to the microcomputer, the first-word read
immediately after the GRAM address setting is latched from the GRAM to the internal read-data latch. The
data on the data bus (DB15-0) becomes invalid and the second-word read is normal.
When bit processing, such as a logical operation, is performed within the HD66760, only one read can be
processed since the latched data in the first word is used.
R/W RS DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
R
1
RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Figure 22 Read Data from GRAM Instruction