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UM6845EA fiches techniques PDF

UMC - CRT Controller

Numéro de référence UM6845EA
Description CRT Controller
Fabricant UMC 
Logo UMC 





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UM6845EA fiche technique
(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 configure the system
with a wide assortment of techniques.
Pin Configuration
GND
RES
lPEN
CCO/MAO
CC1/MAl
CC2/MA2
CC3/MA3
CC4/MA4
CC5/MA5
CC6/MA6
CC7/MA7
CRO/MA8
CR1/MA9
CR2/MA10
CR3/MAll
CR4/MA12
CR5/MA13
DISPLAY ENABLE
CURSOR
VCC
Block Diagram
VSYNC
HSYNC
RAO
RAl
RA2
RA3
RA4
DBO
DBl
DB2
DB3
DB4
DB5
DB6
DB7
CS
RS
E
R/W
CClK
VCC GND
DBO-DB7
E
R/W
CS
RS - - _ _ .
HSYNC
VSYNC
DISPLAY ENABLE
CURSOR
LPEN
CClK
RES
\MAO-MA13 RAO-RA4/
VIDEO DISPLAY RAM AND CHARACTER ROM
5-39

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