Enhanced Monitor On-Screen Display CMOS

The MC141541 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 273 bytes display/control RAM. By storing a full screen of data and control information, this device has the capability to carry out ‘screen–refresh’ without MCU supervision.

• Two Selectable Resolutions: 320 (CGA) and 480 (EGA) Dots per Line
• Fully Programmable Character Array of 10 Rows by 24 Columns
• 273 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 (52.8 MHz Dot Clock at 480 Mode)
• Programmable Vertical Height of Character to Meet Multi–Sync Requirement
• Programmable Vertical and Horizontal Positioning for Display Center
• 120 Characters and Graphic Symbols ROM and Eight Programmable Character RAM
• 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