Document
(l)UMC
UM6845£/UM6845£A/UM6845£B
CRT Controller
Features
• Single + 5 volt (± 5%) power supply
• Alphanumeric and limited graphics capabilities • Fully programmable display (rows, columns, blanking,
etc.). • Interlaced or non-interlaced scan • 50/60 Hz operation • Fully programmable cursor • External light pen capability • Capable of addressing up to 16K character Video
Display RAM
• No DMA required • Pin-compatible with MC6845R • Row/Column or straight-binary' addressing for Video
Display RAM • Video Display RAM may be configured as part of
microprocessor memory field or independently slaved to 6845 • Internal status register 3.7 MHz character clock • Transparent address mode
General Description
The UM6845E is a CRT Controller intended to provide capability for interfacing and 8 or 16 bit microprocessor family to CRT or TV-type raster scan displays. A unique
feature is the inclusion of several modes of operation, so that the system designer can con.