Renesas R61509V - Manual (Page 17)

R61509V Target Spec
Rev. 0.11 April 25, 2008, page 17 of 181
Table 8 LCD drive
Signal I/O Connect to Function
When not in
use
VREG1OUT O Stabilizing
capacitor
Output voltage generated from the reference voltage VCIR. The factor
is determined by instruction (VRH bits).
VREG1OUT is used for (1) source driver grayscale reference voltage
VREG1OUT, (2) VCOMH level reference voltage, and (3) VCOM
amplitude reference voltage. Connect to a stabilizing capacitor.
VREG1OUT =4.0V ~ (DDVDH – 0.5)V
―
VCOM O TFT panel
common
electrode
Power supply to the TFT panel’s common electrode. VCOM alternates
between VCOMH and VCOML. The alternating cycle is set by internal
register. Also, the VCOM output can be started and halted by register
setting.
―
VCOMH O Stabilizing
capacitor The High level of VCOM amplitude. The output level can be adjusted
by either external resistor (VCOMR) or electronic volume.
―
VCOML O Stabilizing
capacitor The Low level of VCOM amplitude. The output level can be adjusted
by instruction (VDV bits). VCOML = (VCL+0.5) V ~ 0V
―
VCOMR I Variable
resistor or
open Connect a variable resistor when adjusting the VCOMH level between
VREG1OUT and GND.
Open
VGS I GND Reference level for the grayscale voltage generating circuit. ―
S1~S720 O LCD Liquid crystal application voltages. Open
G1~G432 O LCD Gate line output signals.
VGH: The gate line is selected.
VGL: The gate line is not selected.
Open