Advanced Monitor On-Screen Display

CMOS

The MC141543 is a high performance HCMOS device designed to interface with a microcontroller unit to allow colored symbols or characters to be displayed on a color monitor. The on–chip PLL allows both multi–system operation and self–generation of system timing. It also minimizes the MCU’s burden through its built–in 493 bytes RAM. By storing a full screen of data and control information, this device has a capability to carry out ‘screen–refresh’ without MCU supervision.

? Three Selectable Resolutions: 320 (CGA), 480 (EGA) or 640 (VGA) Dots per Line

? Fully Programmable Character Array of 15 Rows by 30 Columns

? 493 Bytes Direct Mapping Display RAM Architecture

? Internal PLL Generates a Wide–Ranged System Clock

? For High–End Monitor Application, Maximum Horizontal Frequency is 110 kHz (70.4 MHz Dot Clock at 640 Mode)

? Programmable Vertical Height of Character to Meet Multi–Sync Requirement

? Programmable Vertical and Horizontal Positioning for Display Center

? 128 Characters and Graphic Symbols ROM (Mask ROM is Optional)

? 10 x 16 Dot Matrix Character

? Character–by–Character Color Selection

? A Maximum of Four Selectable Colors per Row

? Double Character Height and Double Character Width

? Character Bordering or Shadowing

? Three Fully Programmable Background Windows with Overlapping Capability

? Provides a Clock Output Synchronous to the Incoming H Sync for External PWM

? M_BUS (IIC) Interface with Address $7A

? Single Positive 5 V Supply