DESCRIPTION
The STV9420/21 is an ON SCREEN DISPLAY for monitor. It is built as a slave peripheral connected to a host MCU via a serial I2C bus. It includes a display memory, controls all the display attributes and generates pixels from the data read in its on chip memory. The line PLL and a special slice interpolator allow to have a display aspect which does not depend on theline and frame frequencies.
I2C interface allows MCU to make transparent internal access to prepare the next pages during the display of the current page. Toggle from one page to another by programming only one register.

■ CMOS SINGLE CHIP OSD FOR MONITOR
■ BUILT IN 1 KBYTE RAM HOLDING :
   - PAGES’DESCRIPTORS
   - CHARACTER CODES
   - USER DEFINABLE CHARACTERS
■ 128 ALPHANUMERIC CHARACTERS OR
   GRAPHIC SYMBOLS IN INTERNAL ROM
   (12 x 18 DOT MATRIX)
■ UP TO 26 USER DEFINABLE CHARACTERS
■ INTERNAL HORIZONTAL PLL (15 TO 120kHz)
■ PROGRAMMABLE VERTICAL HEIGHT OF
   CHARACTER WITH A SLICE INTERPOLATOR
   TO MEET MULTI-SYNCH REQUIREMENTS
■ PROGRAMMABLE VERTICAL AND HORIZONTAL POSITIONING
■ FLEXIBLE SCREEN DESCRIPTION
■ CHARACTER BY CHARACTER COLOR SELECTION (UP TO 8 DIFFERENT COLORS)
■ PROGRAMMABLE BACKGROUND (COLOR, TRANSPARENT OR WITH SHADOWING)
■ CHARACTER BLINKING
■ 2-WIRES ASYNCHRONOUS SERIAL MCU INTERFACE (I2C PROTOCOL)
■ 4 x 8 BITS PWM DAC OUTPUTS ON THE STV9421
■ SINGLE POSITIVE 5V SUPPLY