ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 106

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
RAiO
TECHNOLOGY INC.
In order to improve the effect of eliminating flicker by check busy, we have two suggestions in real
application :
So if you want to eliminate flicker by check busy of this way, we support a suggestion ITCR setting value
just like Figure 6-80 and Figure 6-81.
MPU speed cannot be too slow(The MPU cycle period cannot be too long, just like Figure 6-78),
The ITCR value cannot be set too small.(just like Figure 6-79), otherwise the effect of eliminating
otherwise the effect of eliminating flicker will be not eminent.
flicker will be not eminent.
SCAN_BUSY
SCAN_BUSY
Memory access cycle
Memory access cycle
Check status bit-6
Check status bit-6
Check status bit-6
Check status bit-6
MPU cycle
MPU cycle
(SCAN BUSY)
(SCAN BUSY)
(SCAN BUSY)
(SCAN BUSY)
Figure 6-78 : Eliminate Flicker (2) MPU Cycle Too Long
Start
Start
XCLK
XCLK
LP
LP
high
high
low
low
Figure 6-77 : Eliminate Flicker (2) Ideal
MPU cycle too long!
MPU cycle too long!
low
low
high
high
ITCR
ITCR
SCAN_BUSY
SCAN_BUSY
MPU cycle
MPU cycle
XCLK
XCLK
LP
LP
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Confliction!
Confliction!
Two Layers Character/Graphic LCD Controller
: Check status bit-6 = 0
: Check status bit-6 = 0
: Check status bit-6 = 1
: Check status bit-6 = 1
: Memory access cycle
: Memory access cycle
ITCR
ITCR
: Check status bit-6 = 0
: Check status bit-6 = 0
: Check status bit-6 = 1
: Check status bit-6 = 1
: Memory access cycle
: Memory access cycle
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RA8806