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7.5.3.3
Layout Notes
Refer to
Section 7.4, "Layout Notes,"
7.5.4
Passive Color Single-Scan Mode
Passive color displays send dithered data to the panel. Each bit of color data requires three pins.
7.5.4.1
Signals
For passive color displays, see
between the PXA27x processor and the LCD panel.
Table 7-6. Passive Display Pins Required
PXA27x
LCD Panel Pin
processor Pin
LDD<7:0>
D<7:0>
L_PCLK_WR
Pixel_Clock
L_LCLK_A0
Line_Clock
L_FCLK_RD
Frame_Clock
L_BIAS
Bias
2
N/A
Vcon
NOTES:
1. "Pin Type" is in reference to the PXA27x processor. Therefore, outputs are pins that drive a signal from the processor to
another device.
2. Vcon is a signal external to the PXA27x processor. Refer to
Note: Names used for "LCD Panel Pin" are representative names and do not match those on all LCD
panels. Similarly, not all signals are required for all modes of operation. Refer to the LCD panel
reference documentation for information on:
•
Specific signals required for correct LCD operation
•
Correct names of the signals used by the LCD panel manufacturer
®
Intel
PXA27x Processor Family Design Guide
for layout notes and considerations.
Table 7-3
for description of the pins required for connections
1
PIn Type
Definition
Data lines used to transmit 2 2/3data values at a time to the LCD
Output
display. Groupings of three pin values represent one pixel (red, green,
and blue data values).
Pixel Clock – used by the LCD display to clock the pixel data into the
Output
line shift register.
Line Clock – used by the LCD display to signal the end of a line of
Output
pixels that transfers the line data from the shift register to the screen
and increment the line pointers.
Frame Clock – used by the LCD displays to signal the start of a new
Output
frame of pixels that resets the line pointers to the top of the screen.
AC bias used to signal the LCD display to switch the polarity of the
Output
power supplies to the row and column axis of the screen to counteract
DC offset.
Contrast voltage – adjustable voltage input to LCD panel – external
N/A
voltage circuitry is required (no pin available on PXA27x processor).
Section 7.4.1, "Contrast Voltage,"
LCD Interface
for detailed information.
II:7-11
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