HD6845R Datasheet (Hitachi Semiconductor)

HD6845R, CRT Controller

HD6845R/HD6845S CRT Controller (CRTC) The CRTC is a LSI controller which is designed to provide an interface for microcomputers to raster scan type CRT displays.

The CRTC belongs to the HD6800 LSI Family and has full compatibility with MPU in both data lines and control lines.

Its primary function is to generate timing signal which is necessary for raster scan type CRT display according to the specification programmed by MPU.

The CRTC is also designed as a programmable controller, so applicable

HD6845R Features

* Number of Displayed Characters on the Screen, Vertical Dot Format of One Character, HOrizontal and Vertical Sync Signal, Display Timing Signal are Programmable

* 3.7 MHz High Speed Display Operation

* Line Buffer-less Refreshing

* 14-bit Refresh Memory Address Outpu