Cirrus-logic EP73xx Manual de usuario descargar pdf (Pagina 99)

EP7309/11/12 User’s Manual - DS508UM4 9-9

LCD Interface

LCD Frame Buffer Start Address (FBADDR)

Address: 0x8000.1000, Read / Write

Definition: This register contains the start address for the LCD Frame Buffer. It

assumes that the frame buffer starts at location 0x0000000 within

each chip select memory region.Value programmed willset the start

address in system memory. On reset, the default value is 0xC which

corresponds to the physical location of 0xC0000000.

The register is 4 bits wide and must only be programmed when the

LCD is disabled (LCDEN bit in SYSCON1 is cleared).

Table 9-2: Gray Scale Value to Color Mapping

Gray scale Value Duty Cycle % Pixels Lit % Step Change

0 0 0% 11.1%

1 1/9 11.1% 8.9%

2 1/5 20.0% 6.7%

3 4/15 26.7% 6.6%

4 3/9 33.3% 6.7%

5 2/5 40.0% 5.4%

6 4/9 44.4% 5.6%

7 1/2 50.0% 0.0%

8 1/2 50.0% 5.6%

9 5/9 55.6% 5.4%

10 3/5 60.0% 6.7%

11 6/9 66.7% 6.6%

12 11/15 73.3% 6.7%

13 4/5 80.0% 8.9%

14 8/9 88.9% 11.1%

15 1 100%

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 157 158

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Cirrus-logic EP73xx Manual de usuario Pagina 99