Lcd Controller Specification; Panel Configuration And Interface - NEC VR4181 mPD30181 User Manual

21.3 LCD Controller Specification

21.3.1 Panel configuration and interface

(1) View rectangle and horizontal/vertical blank
Most parameters of the LCD controller are described using a coordinate system. The x coordinate increases as a
point moves to the right. The y coordinate increases as a point moves down. The origin is (0, 0).
The size of the bounding box is specified by Vtotal and Htotal. The point (Vtotal–1, Htotal–1) is the box's lower
right corner and includes the horizontal and vertical blanks. Vvisible and Hvisible define the view rectangle, and
outside of the view rectangle are the horizontal blank and vertical blank.
Origin
(0, 0)
(0, Vvisible−1)
Vertical
blank
Each parameter is defined using bit values in the LCD controller registers as follows:
• Vtotal = Vtot(8:0)
• Vvisible = Vact(8:0)
• Htotal = Htot(7:0) x 2
• Hvisble = Hact(5:0) x 8
Caution The following expressions must be satisfied.
1. Vtotal ≥ ≥ ≥ ≥ Vvisible
2. Htotal ≥ ≥ ≥ ≥ Hvisible + 6
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CHAPTER 21 LCD CONTROLLER
Figure 21-2. View Rectangle and Horizontal/Vertical Blank
View rectangle
(LCD panel)
Y
VRTOTALREG (0x0A00 0408)
VRVISIBREG (0x0A00 040A)
HRTOTALREG (0x0A00 0400)
HRVISIBREG (0x0A00 0402)
User's Manual U14272EJ3V0UM
(Hvisible−1, 0)
(Hvisible−1, Vvisible−1)
(Htotal−1, Vtotal−1)
X
Horizontal
blank