ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 39

• Manufacturer Part Number: ra8835a
• Description: Dot Matrix Lcd Controller
• Manufacturer: RAIO Technology Inc.

RAiO TECHNOLOGY INC.
Version 1.0
The allowable writing duration is since “5 x 9 x t
frequency) from the positive going edge of LP up to {(TCR) – (C/R) – 7} x 9 x t
Currently employed D6 status flag reading method does not identify the timing when the read D6 =
Low took place. Thus, negative going edge of LP should be used as the interrupt signal when
implementing the writing in above timing. If you try to access the display memory in other timing than
the above, flickering of the display screen will result.
• Precaution on the write timing to VRAM
CS
Figure 7-7: Flowchart for Busy Flag Checking
0
A0
0
RD
0
39/88
0: Period of retrace lines
1: Period of display
OSC
” has elapsed (t
D
6
(flag)
OSC
= 1/f
Dot Matrix LCD Controller
OSC
: a cycle of the oscillation
OSC
.
RA8835A
www.raio.com.tw