S1D13700F02A100 Datasheet, PDF (50/134 Pages) EPCOS – Hardware Functional Specification

Page 50
Epson Research and Development
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REG[01h] Horizontal Character Size Register
Address = 8001h Default = 00h
MOD
n/a
7
6
5
4
Read/Write
Horizontal Character Size bits 3-0
3
2
1
0
bit 7
MOD
This bit selects the AC frame drive waveform period. MOD is typically set to 1.
When this bit = 0, 16-line AC drive is selected.
When this bit = 1, two-frame AC drive is selected.
bits 3-0
In two-frame AC drive, the MOD period is twice the frame period. In 16-line AC drive,
MOD inverts every 16 lines. Although 16-line AC drive gives a more readable display,
horizontal lines may appear when using high LCD drive voltages or at high viewing angles.
Horizontal Character Size (FX) bits [3:0]
These bits define the horizontal size, or width, of each character, in pixels.
REG[01h] bits 3-0 = Horizontal Character Size in pixels - 1
The S1D13700F02 handles display data in 8-bit units, therefore characters larger than 8
pixels wide must be formed from 8-pixel segments. The following diagram shows an
example of a character requiring two 8-pixel segments where the remainder of the second
eight bits are not displayed. This also applies to the second screen layer. In graphics mode,
the normal character field is also eight pixels. If a wider character field is used, any
remainder in the second eight bits is not displayed.
FX
FY
8 bits
8 bits
FX
FY
8 bits
8 bits
Address A Address B
Non-display area
Where:
FX = horizontal character size in pixels (REG[01h] bits 3-0)
FY = vertical character size in pixels (REG[02h] bits 3-0)
Figure 10-4 Horizontal and Vertical Character Size Example
S1D13700F02
X42D-A-001-01
Revision 1.4
Hardware Functional Specification
Issue Date: 2011/01/14