MC141543

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 onchip PLL allows both multisystem operation and selfgeneration of system timing. It also minimizes the MCU's burden through its builtin 493 bytes RAM. By storing a full screen of data and control information, this device has a capability to carry out 'screenrefresh' without MCU supervision.

Since there is no spacing between characters, special graphicsoriented characters can be generated by combining two or more character blocks. There are three different resolutions that users can choose. By changing the number of dots per horizontal line to 320 (CGA), 480 (EGA) or 640 (VGA), smaller characters with higher resolution can be easily achieved.

Special functions such as character bordering or shadowing, multilevel windows, double height and double width, and programmable vertical length of character can also be incorporated. Furthermore, neither massive information update nor extremely high data transmission rate are expected for normal on screen display operation, and serial protocols are implemented in lieu of any parallel formats to achieve minimum pin count.