S1D13700 Epson Electronics America, Inc., S1D13700 Datasheet - Page 70

• Manufacturer Part Number: S1D13700
• Description: LCD Controller ICs
• Manufacturer: Epson Electronics America, Inc.

STATUS FLAG
• Precaution on the write timing to VRAM
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
64
<Timing To Be Observed For Avoiding S1D 13305 Series Write Noise>
The allowable writing duration is since “5 9
oscillation frequency) from the positive going edge of LP up to {(TCR) – (C/R) – 7}
Figure 55. Flowchart for busy flag checking
No
No
EPSON
Read Status Flag
Data Input ?
Data Input
D6 = 0?
t
OSC
above timing.
If you try to access the display memory in other timing
than the above, flickering of the display screen will result.
Yes
Yes
” has elapsed (
t
OSC
= 1/
f
OSC
: a cycle of the
9
S1D13305 Series
Technical Manual
t
OSC
.