S1D13305D00A EPSON [Epson Company], S1D13305D00A Datasheet - Page 71

• Manufacturer Part Number: S1D13305D00A
• Description: LCD Controller ICs
• Manufacturer: EPSON [Epson Company]

15. RESET
The S1D13305 series requires a reset pulse at least 1 ms
long after power-on in order to re-initialize its internal
state.
For maximum reliability, it is not recommended to apply
a DC voltage to the LCD panel while the S1D13305 series
is reset. Turn off the LCD power supplies for at least one
frame period after the start of the reset pulse.
16. APPLICATION NOTES
16.1. Initialization Parameters
The parameters for the initialization commands must be
determined first. Square brackets around a parameter
name indicate the number represented by the parameter,
rather than the value written to the parameter register. For
example, [FX] = FX + 1.
16.1.1. SYSTEM SET instruction and
S1D13305 Series
Technical Manual
FX
The horizontal character field size is determined from
the horizontal display size in pixels [VD] and the
number of characters per line [VC].
C/R
C/R can be determined from VC and FX.
where RND(x) denotes
highest integer. [C/R] is the number of bytes per line,
not the number of characters.
[VD] / [VC] [FX]
[C/R] = RND ([FX] / 8) [VC]
RES
V
DD
parameters
rounded up to the next
0.7 V
Figure 56. Reset timing
DD
EPSON
1ms reset pulse
The S1D13305 series cannot receive commands while it
is reset. Commands to initialize the internal registers
should be issued soon after a reset.
During reset, the LCD drive signals XD, LP and FR are
halted.
A delay of 3 ms (maximum) is required following the
rising edges of both RES and V
stabilization.
TC/R
TC/R must satisfy the condition [TC/R] [C/R] + 4.
f
Once TC/R has been set, the frame frequency, f
lines per frame [L/F] will also have been set. The
lower limit on the oscillator frequency f
by:
If no standard crystal close to the calculated value of
f
the value of TC/R revised using the above equation.
Symptoms of an incorrect TC/R setting are listed
below. If any of these appears, check the value of TC/
R and modify it if necessary.
• Vertical scanning halts and a high-contrast hori-
• All pixels are on or off.
• The LP output signal is absent or corrupted.
• The display is unstable.
OSC
OSC
zontal line appears.
f
exists, a higher frequency crystal can be used and
and f
OSC
FR
([TC/R] 9 + 1)
0.3 V
RESET/APPLICATION NOTES
DD
DD
[L/F] f
to allow for system
FR
OSC
is given
FR
, and
65