Datasheet

1061
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
Figure 45-7. TFT Panel Timing (Line Expanded View), CLKMOD = 1
Usually the LCD_FRM rate is about 70 Hz to 75 Hz. It is given by the following equation:
where:
• HOZVAL determines de number of LCDDOTCK cycles per line
• LINEVAL determines the number of LCDHSYNC cycles per frame, according to the expressions shown below:
In STN Mode:
In monochrome mode, Horizontal_display_size is equal to the number of horizontal pixels. The number_data_lines
is equal to the number of bits of the interface in single scan mode; number_data_lines is equal to half the bits of the
interface in dual scan mode.
In color mode, Horizontal_display_size equals three times the number of horizontal pixels.
In TFT Mode:
The frame rate equation is used first without considering the clock periods added at the end beginning or at the end
of each line to determine, approximately, the LCDDOTCK rate:
With this value, the CLKVAL is fixed, as well as the corresponding LCDDOTCK rate.
Then select VHDLY, HPW and HBP according to the type of LCD used and “Equation 1” on page 1059.
Finally, the frame rate is adjusted to 70 Hz - 75 Hz with the HFP value:
VHDLY+1 HBP+1 HPW+1 HFP+VHDLY+2
HOZVAL+1
LCDDOTCK
LCDD
1 PCLK
1/2 PCLK
1/2 PCLK
Line Period
LCDVSYNC
LCDHSYNC
LCDDEN
1
f
LCDVSYNC
--------------------------- -
VHDLY HPW HBP HOZVAL HFP 4()+++ ++
f
LCDDOTCK
--------------------------------------------------------------------------------------------------------------------------
⎝⎠
⎛⎞
VBP LINEVAL VFP 1+++()=
HOZVAL
Horizontal_display_size
Number_data_lines
-------------------------------------------------------------- - 1–=
LINEVAL Vertical_display_size 1–=
HOZVAL Horizontal_display_size 1–=
LINEVAL Vertical_display_size 1–=
f
lcd_pclk
HOZVAL 5+()f
lcd_vsync
LINEVAL 1+()×()×=
HFP f
LCDDOTCK
1
f
LCDVSYNC
LINEVAL VBP VFP 1+++()×
------------------------------------------------------------------------------------------------------------- -
VHDLY HPW HPB HOZVAL 4+++ +()–×=