ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 105

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

Preliminary Version 1.2
The ideal condition just likes the Figure 6-75. But if the condition likes Figure 6-76, the little part of confliction
that we can not avoid. So if user wants to eliminate the flicker completely by checking SCAN_BUSY, user can
use the method just like the Figure 6-77.
RAiO
TECHNOLOGY INC.
Memory access cycle
Memory access cycle
Memory access cycle
SCAN_BUSY
SCAN_BUSY
Check status bit-6
Check status bit-6
Check status bit-6
(SCAN BUSY)
(SCAN BUSY)
(SCAN BUSY)
MPU cycle
MPU cycle
Start
Start
Start
XCLK
XCLK
low
low
low
LP
LP
Figure 6-76 : Eliminate Flicker (1) Confliction
Figure 6-75 : Eliminate Flicker (1) Ideal
high
high
high
SCAN_BUSY
SCAN_BUSY
MPU cycle
MPU cycle
XCLK
XCLK
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LP
LP
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