Xilinx Virtex-4 ML461 User Manual page 95

R
•
After the SHL bit is configured, these settings normally are not changed.
•
The following steps are performed next:
•
•
•
Table B-5: Resistor Value Settings
Table B-6: Reference Voltage Parameters
At startup of the LCD controller (after RESETB operation), the resistor and reference
voltage values are:
•
•
The Resistor selection value MUST be set to 101b when using this LCD panel.
After the display is brought to operational mode, it is best to wait at least 1 ms to ensure the
stabilization of power supply levels. After this time, all other necessary display
initializations can be performed.
Virtex-4 ML461 Development Board User Guide
UG079 (v1.1) September 5, 2007
Configure the SHL bit. This bit sets the scanning direction of the COM lines.
♦
When the RESETB signal is active, SHL is reset to 0, meaning that the segments
are scanned from COM1 up to COM64.
♦
When SHL is set to 1, the common lines are scanned in opposite direction.
Select the LCD bias settings.
♦
The duty cycle is selected as 1/65 by hardwiring the controller IC pads on the
display PCB.
♦
The LCD bias is set to:
- 1/7: when the BIAS bit is 0
- 1/9: when the BIAS bit is 1
Start the onboard converter, regulator, and follower
Set the Regulator Resistor values (see
Configure the reference voltage register parameters (see
000 001
1+(Rb/Ra) 1.90 2.19
SV5 SV4 SV3 SV2
0 0 0 0
0 0 0 0
.. .. ... ..
.. .. .. ..
1 1 1 1
1 1 1 1
Resistor selection is: 0,0,0
Reference voltage is: 1,0,0,0,0,0
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Table B-5)
3-Bit Data Settings (R2 R1 R0)
010 011 100
2.55 3.02 3.61
SV1 SV0 Reference Voltage Parameter (α)
0 0
0 1
.. ..
.. ..
1 0
1 1
Hardware Schematic Diagram
Table B-6)
110 111
101
4.35 5.29 6.48
0
1
..
..
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