Preliminary
KS2508
OSD PROCESSOR FOR MONITOR
OVERVIEW
The KS2508 is used to display some characters or symbols on
a screen of monitor. Basically, the operation is to control the
internal memory on chip and generate the R,G,B signals for
some characters or symbols. The R,G,B signals are synchro-
nized with the horizontal sync. Then the R,G,B signals are
mixed with the main video signal in the Video Amp IC.
The font data for characters or symbols are stored in the inter-
nal ROM. This stored data are accessed and controlled by the
control data from a micro controller. The control data are trans-
mitted through the I
2
C bus. All timing control signals including
the system clock are synchronized with the horizontal sync.
Therefore there is a PLL circuitry on chip.
16-DIP-300
FEATURES
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256 ROM fonts (Each font consists of 12 x 18 dots.)
Full Screen Memory Architecture
Wide range PLL available (15 kHz ~ 120 kHz)
Programmable vertical height of character
Programmable vertical and horizontal positioning
Character color selection up to 16 different colors
Programmable background color (Up to 16 colors)
Character blinking, bordering and shadowing
Color blinking
Character scrolling
Fade-in and fade-out
Box drawing
Character sizing up to four times
96 MHz pixel frequency from on-chip PLL
IIC Protocol Data Transmission (Slave Address : BAH)
ORDERING INFORMATION
Device
Package
Operating Temperature
0
擄C
~ 70
擄C
KS2508 16-DIP-300
1
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