LMR4769EW-WCB DENSITRON, LMR4769EW-WCB Datasheet - Page 72

• Manufacturer Part Number: LMR4769EW-WCB
• Description: LCD MODULE, 240X320, BLUE
• Manufacturer: DENSITRON

Specifications of LMR4769EW-WCB

• Lcd Display Type: STN
• Pixel Size (h X W): 0.34mm X 0.34mm
• Display Mode: Transflective
• Interface Type: Serial
• Viewing Area (h X W): 92.14mm X 120.14mm
• Supply Voltage: 32V
• External Depth: 15.6mm
• External: RoHS Compliant
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Backlighting Colour: Blue
• Pixel Pitch (h X W): 0.36mm X 0.36mm

S1D13700 Technical Manual
(6) Dotwise scrolling in the X direction (HDOT SCR)
SAD = SAD
SAD = SAD + 1
Figure 4-10 shows the relationship between commands and display when a display pattern is smoothly
scrolled to the left. In this case, the screen (window) moves to the right on a virtual screen. Therefore, the
MPU only needs to sequentially increment the value of the HDOT SCR command parameter (number of
dots to be shifted) without modifying the display start address (SAD) in the S1D13700 to shift display
leftward one dot at a time. Then when display has been dot-shifted a distance equal to the character field,
the MPU should reset the value of the HDOT SCR command parameter to 00H and simultaneously
increment SAD by one address. Thus, smooth scrolling in the X direction is possible by performing this
series of operations at appropriate time intervals.
To scroll the display pattern to the right, change the display dot address by reversing the order above.
Should the window reach either edge of the virtual screen, use the MPU to manage the screen. Note that
when smooth scrolling continues, the screen is not affected.
Also note that when scrolling display dotwise in the X direction using the HDOT SCR command, scrolling
cannot be controlled separately in each layer because all layers are scrolled at the same time.
Note: Because the speed at which the LCD responds to instructions varies with temperature,
smooth scrolling at low temperatures in particular may not easily be recognized.
Figure 4-10 Example of using HDOT SCR ([FX] = 8)
HDOT SCR
parameter value
P1 = 00H
P1 = 01H
P1 = 02H
P1 = 03H
P1 = 07H
P1 = 00H
Off the screen
EPSON
SAD
Screen
SAD+1 SAD+2
Enlarged view
Virtual screen
Screen
4: FUNCTION DESCRIPTION
C/R
AP
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