Mitsubishi DPLUS 74SB -BKB, Service Manual

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10. On Screen Display
MTV030
On-Screen Display with Auto-Sizing Controller
FEATURES
• Horizontal SYNC input up to 150 kHz.
• On-chip PLL circuitry up to 150MHz.
•
Minimum timing measurement among HFLB, VFLB, RIN, GIN
and BIN for auto sizing.
•
Full screen self-test pattern generator.
•
Programmable Hor. resolutions up to 1524 dots per line.
•
Full-screen display consists of 15 (rows) by 30 (columns)
•
Two font size 12
×
16 or 12
×
18 dot matrix per character.
•
True totally 512 mask ROM fonts including 496 standard fonts
and 16 multi-color fonts.
•
Double character height and/or width control.
• Programmable positioning for display screen center.
• Character bordering, shadowing and blinking effect.
• Programmable character height (18 to 71 lines) control.
• Row to row spacing control to avoid expansion distortion.
• 4 programmable windows with multi-level operation.
• Shadowing on windows with programmable shadow width/
height/color.
• Programmable adaptive approach to handle H, V sync collision
automatically by hardware.
•
Software clears bit for full-screen erasing.
•
Fade-in/fade-out or blending-in/blending-out effects.
•
5-channel/8-bit PWM D/A converter output.
•
Compatible with SPI bus or I²C interface with slave address
7AH/7BH (slave address is mask option).
•
16-pin, 20-pin or 24-pin PDIP package.
GENERAL DESCRIPTION
MTV030 is designed for monitor applications to display built-in
characters or fonts onto monitor screen. The display operation
occurs by transferring data and control information from the
micro-controller to RAM through a serial data interface. It can
execute full-screen display automatically, as well as specific
functions such as character background, bordering, shadowing,
blinking, double height and width, font by font color control,
frame positioning, frame size control by character height and
row to row spacing, horizontal display resolution, full-screen
erasing, fade-in/fade-out effect, ndowing effect, shadowing on
window and full-screen self-test pattern generator.
MTV030 provides true 512 fonts including 496 standard fonts
and 16 multi-color fonts and 2 font sizes, 12x16 or 12x18 for
more efficacious applications. So each one of the 512 fonts
can be displayed at the same time. The full OSD menu is formed
by 15 rows x 30 columns, which can be positioned anywhere
on the monitor screen by changing vertical or horizontal delay.
The auto sizing video measurement module measure the timing
relationship among HFLB, VFLB, and R, G, BIN at the speed related
to the OSD resolution. MCU can get the measurement data, active
video, front porth and back porth, through I
2
C bus read/write
operation to keep the appropriate display size and center.
BLOCK DIAGRAM