SGX-120L User Manual, rev2.0
Page 16 of 21
http://www.seetron.com/sgxmnl.htm
2002-11-13
The text font is stored in the same format as normal full-screen images. It consists of two screens stored
at EEPROM locations 0 and 1. Each character occupies a specific 6- by 8-pixel rectangle of these
screens as shown in
figure 3
.
If you create your own font, you should probably use this one (files
chars0.bmp
and
chars1.bmp
on the
starter disk) as a starting point. Just open the appropriate file with Paint and make your changes.
Design Notes and Specifications
The G12032 is designed to speed prototyping and enable the creation of bench-top instruments requiring
a serially driven text/graphics display. It is not meant for direct use by non-technical users or for
incorporation into mass-produced consumer equipment. It has not been tested to EMC/EMI/ESD
standards. (The same is true of most single-board computers and other subassemblies whose specs do
not specifically include compliance data.) It is up to the purchaser to determine whether the G12032 is
suitable for the intended use.
This unit is designed and manufactured to high standards of quality. This notice is simply intended to head
off invalid assumptions that might affect decisions about using the G12032 in consumer products.
Differences from the G12864
The G12032 is similar to the G12864 graphics display. There are a few differences:
NOTE: The G12864 has a minor bug regarding proper termination of decimal numbers. The G12864 is
supposed to discard the 'throwaway' character that follows a decimal number. However, it does not
discard ESC. This means that programs that don't terminate numbers properly, but do send a series of
ESC instructions will work when they shouldn't--the ESC from the next instruction terminates the previous
number and begins a new instruction. The G12032 works exactly as described, and won't let you get away
with improperly terminated numbers. If you port code from the G12864 to the G12032, be on the lookout
for this difference.
Feature
G12032
G12864
Size in pixels (horizontal x vertical)
120x32
128x64
Separate memory layers for text and graphics
NO
YES
Font layout in pixels (horizontal x vertical)
6x8
8x16
Multiple font sizes
YES
NO
Multiple font pages
YES
NO
Text cursor
NO
YES
Built-in DB9 serial connector
NO
YES
Right-alignment instruction
YES
NO
Configuration switch to flip screen vertically
NO
YES
Serial output
NO
YES
Masked reverse instruction to invert selected lines
YES
NO
Y coordinate flip to place origin at bottom or top of
screen
YES
NO
Unregulated power input
9V battery
AC adapter
Font Structure
