r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 968

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

19. Display Unit (DU)
• 16 bit/pixel: ARGB
• YC
Rev.1.00 Jan. 10, 2008 Page 938 of 1658
REJ09B0261-0100
D15-D0 15
Address A
Address A+4
Address A+8
The ARGB levels are represented using A:1, R:5, G:5, B:5 bits (ARGB555). In addition to the
RGB values, an alpha value is set. Blending control using the A value is valid when the
PnSPIM bit in PnMR is set to perform blending; when A = 1, blending is performed. When the
PnSPIM bit is not set to perform blending, blending is not performed even when A = 1.
Image data has the format YC (YCbCr) = 4:2:2. A calculation circuit is used to convert each of
the 8 bits of the RGB colors of image data.
The YC data order corresponds to the UYVY format and YUYV format. The UYVY format
and YUYV format can be selected using the PnYCDF bits in PnMR.
The conversion formulae for each of the 8 bits of the RGB colors are as follows:
The following coefficients are used for the above formulae.
(1)
(2)
(3)
(4)
The internal processing is performed in 16-bit units.
Calculation is performed with fixed-point arithmetic and values are rounded down.
R = Y + 1.37 × (Cr - 128)
G = Y - 0.698 × (Cr - 128) - 0.336 x (Cb - 128)
B = Y + 1.73 × (Cb - 128)
16 ≤ Y ≤ 235
16 ≤ Cr ≤ 240
16 ≤ Cb ≤ 240
A
1.37 = 1.0101111
1.73 = 1.1011110
0.698 = 0.10110010
0.336 = 0.01010110
A+2
31
ARGB555 - 1
ARGB555- 3
ARGB555- 5
14
Little endian
R
A
15
ARGB555- 0
ARGB555- 2
ARGB555- 4
10
9
0
Address A
Address A+4
Address A+8
G
A
ARGB555- 0
ARGB555- 2
ARGB555- 4
31
5
4
Big endian
A+2
15
ARGB555- 1
ARGB555- 3
ARGB555- 5
B
0
0