Figure 3-2 Typical Relationship Between Fx/Fy And Display Addresses - Epson S1D13700 User's & Technical Manual

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[Parameter P2]
FX
Defines the size of the character field in the X direction (i.e., size of one character including a
space).
Structure of the character field
1. Because the S1D13700 processes the display data in 8-bit units, if the character font exceeds 8 bits, the
text screen must configure one character with two or more display memory addresses as normally prac-
ticed. In this case, odd-numbered bits less than a unit of 8 bits are not displayed as shown below. Odd-
numbered bits less than a unit of 8 bits are also not displayed on the back-layered screen as shown below.
2. In graphic display mode, the character field must normally be 8 bits long. For other character fields, odd-
numbered bits less than a unit of 8 bits are not displayed.
8 bits
FY
Address A
<Text screen>

Figure 3-2 Typical relationship between FX/FY and display addresses

In grayscale mode, FX must be fixed to '00111' (8 dots).
WF
Specifies the AC drive method of the liquid crystal.
WF
The two-frame AC drive method is an AC drive method in which the half period of the WF
signal constitutes a one-frame interval. Normally, set WF = 1.
The line inversion drive method is a modified AC drive method in which the WF signal has its
waveform inverted every 16 Y lines.
Note: Although the LCD may look better when WF is set to 0, stripes in the X direction
S1D13700 Technical Manual
BIN
HEX
D4 D3 D2 D1 D0
00
0
0
0
01
0
0
0
07
0
0
1
FX
8 bits
8 bits
Address C
Address B
0: Line inversion drive method
1: Two-frame AC drive method (method B)
will appear when the LCD drive voltage is high or viewing angle large.
EPSON
3: COMMANDS AND COMMAND REGISTERS
Number of dots
[FX]
0
0
1
0
1
2
1
1
8
8 bits
Not displayed
<Background layer>
FX
8 bits
8 bits
FY
21

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