User Manual

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 Fram e Buffer. It

assumes tha t the fram e buffer starts at location 0x0000000 within

each chip select memory region. Valu e programmed will set the start

address in sys tem memory. On reset, the default value i s 0xC which

corresponds to the physical location of 0xC0000000.

The register is 4 bits wide an d 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%