RA8806 Datasheet, PDF (37/174 Pages) RAIO Technology Inc. – Two Layers Character/Graphic LCD Controller Specification

Preliminary Version 1.0
RA8806
Two Layers Character/Graphic LCD Controller
6-2-3 Com/Seg Scan Direction
RA8806 supports a special feature to reverse the Common and Segment signal. User could use
this feature to change the direction of cursor and display data. If use text rotate function and set
CDIR = 1, then use could show text in vertical display. Please refer to Section 6-10-4.
Reg.
MISC
Bit_Num
Table 6-7
Description
Bit 1
Bit 0
Define the order of Segment signals. (SDIR)
Define the order of Common signals. (CDIR)
Reference
REG[01h]
SEG0 .............................................. SEG319
COM0
:
Cursor Moving way
:
:
:
:
:
:
:
COM239
(1) SDIR = 0
SEG0 …………………………………. SEG319
COM0
:
Cursor Moving way
:
:
:
:
:
:
:
COM239
(2) SDIR = 1
Figure 6-14 : Example for Change Segment Direction
6-2-4 Idle Time Counter (ITCR)
ITCR(REG[90h]) is used to determine the idle time during the LP peer-to-peer time. It has following
meanings in function.
1. Adjusting the Frame Rate.(By extending the scan time of each COM)
2. Avoiding the generation of “Flicker”.
The “Flicker” is generated by the violation of LCD scan cycle and Memory write cycle. “Flicker”
means the noise of the scan data at such violation. By setting the ITCR, user can write the display
memory only at “Idle” time to eliminate the “Flicker”.
XCLK
LP
RAiO TECHNOLOGY INC.
ITCR
T_COM
COM_SCAN
Figure 6-15 : Idle Time Period
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