SH7760 Datasheet, PDF (1115/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

It is also possible for the user to set the color palette when necessary, according to the
procedure below.
1. The PALEN bit in the LDPALCR is 0 (initial value); normal display operation
2. Access LDPALCR and set the PALEN bit to 1; enter color-palette setting mode after three
cycles of peripheral clock.
3. Access LDPALCR and confirm that the PALS bit is 1.
4. Access LDPR00 to LDPRFF and write the required values to the PALD00 to PALDFF bits.
5. Access LDPALCR and clear the PALEN bit to 0; return to normal display mode after a cycle
of peripheral clock.
While the PALS bit in LPDALCR is set to 1, the display data for the LCDC (LCD_DATA) will
output a value of 0.
31
Color
23
15
7
0
R7 R6 R5 R4 R3 R2 R1 R0 G7 G6 G5 G4 G3 G2 G1 G0 B7 B6 B5 B4 B3 B2 B1 B0
Monochrome
M7 M6 M5 M4 M3 M2 M1 M0
Figure 30.3 Color-Palette Data Format
PALDnn color and gradation data should be set as above.
For a color display, PALDnn [23:16], PALDnn [15:8], and PALDnn [7:0] respectively hold the R,
G, and B data. However, although there are register bits at PALDnn [18:16], PALDnn [9:8], and
PALDnn [2:0], there is no corresponding memory for them. PALDnn [18:16], PALDnn [9:8], and
PALDnn [2:0] are thus not available for storing palette data. The numbers of valid bits are thus R:
5, G: 6, and B: 5. However, 24-bit (R: 8 bits, G: 8 bits, and B: 8 bits) data should be written to the
palette-data registers. When the values for PALDnn [23:19], PALDnn [15:10], or PALDnn [7:3]
are not 0, 1 or 0 should be written to PALDnn [18:16], PALDnn [9:8], or PALDnn [2:0],
respectively. When the values of PALDnn [23:19], PALDnn [15:10], or PALDnn [7:3] are 0, 0
should be written to PALDnn [18:16], PALDnn [9:8], or PALDnn [2:0], respectively. Data is thus
extended to 24 bits.
Grayscale data for a monochromatic display should be set in PALDnn [7:3]. PALDnn [23:8] are
all "don't care". When the value in PALDnn [7:3] is not 0, 1s should be written to PALDnn [2:0].
When the value in PALDnn [7:3] is 0, 0s should be written to PALDnn [2:0]. Data is thus
extended to 8 bits.
Rev. 1.0, 02/03, page 1065 of 1294