SED1330F Datasheet, PDF (121/148 Pages) List of Unclassifed Manufacturers – LCD Controller ICs

9.0 – 9.1.1
9.0 Application Notes
9.1 Initialization Parameters
The parameters for the initialization commands must
be determined first. Square brackets around a param-
eter name indicate the number represented by the
parameter, rather than the value written to the param-
eter register. For example, [FX] = FX + 1.
9.1.1 SYSTEM SET Instruction and Param-
eters
• FX
The horizontal character field size is deter-
mined from the horizontal display size in pixels
[VD] and the number of characters per line
[VC].
[VD] / [VC] ≤ [FX]
VD: # of X-directional dots
VC: # of X-directional characters
• C/R
C/R can be determined from VC and FX.
[C/R] = RND([FX] / 8) × [VC]
where RND(x) denotes x rounded up to the
next highest integer. [C/R] is the number of
bytes per line, not the number of characters.
9.0 Application Notes
• TC/R
TC/R must satisfy the condition [TC/R] ≥ [C/R]
+ 4.
• f_OSC and f_FR
Once TC/R has been set, the frame frequency,
f_FR, and lines per frame [L/F] will also have
been set. The lower limit on the oscillator
frequency f_OSC is given by:
f_OSC ≥ ([TC/R] × 9 + 1) × [L/F] × f_FR
• If no standard crystal close to the calculated
value of f_OSC exists, a higher frequency crystal
can be used and 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-con-
trast horizontal line appears.
• All pixels are on or off.
• The LP output signal is absent or cor-
rupted.
• The display is unstable.
Table 31. Epson LCD unit example parameters (SED1335F only)
Resolution (X × Y)
[FX]
[FY]
[C/R]
TC/R
fOSC (MHz)
See Note 2
256 × 64
512 × 64
256 × 128
512 × 128
[FX] = 6 pixels:
256 / 6 = 42 remainder 4
= 4 blank pixels
8 or 16, depending
on the screen
[C/R] = 42 = 2AH bytes:
C/R = 29H. When using HDOT 2DH
SCR, [C/R] = 43 bytes
1.85
[FX] = 6 pixels:
512 / 6 = 85 remainder 2
= 2 blank pixels
8 or 16, depending
on the screen
[C/R] = 85 = 55H bytes:
C/R = 54H. When using HDOT 58H
SCR, [C/R] = 86 bytes
3.59
[FX] = 8 pixels:
256 / 8 = 32 remainder 0
= no blank pixels
8 or 16, depending
on the screen
[C/R] = 32 = 20H bytes:
C/R = 19H. When using HDOT 22H
SCR, [C/R] = 33 bytes
2.90
[FX] = 10 pixels:
512 / 10 = 51 remainder
2 = 2 blank pixels
8 or 16, depending
on the screen
[C/R] = 102 = 66H bytes:
C/R = 65H. When using HDOT 69H
SCR, [C/R] = 103 bytes
8.55
Notes:
1. The remainder pixels on the right-hand side of the display are automatically blanked by the SED1335F. There is no need to
zero the display memory corresponding to these pixels.
2. Assuming a frame frequency of 60 Hz.
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