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UM6845B fiches techniques PDF

UMC - CRT Controller

Numéro de référence UM6845B
Description CRT Controller
Fabricant UMC 
Logo UMC 





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UM6845B fiche technique
(l)UMC
UM6845/UM6845A/UM6845B
CRT Controller
Features
• Applications include smart, programmable, intelligent
CRT terminals; video games; information display
• Alphanumeric, semi-graphic, and full graphic capa-
bility
• Fully programmable via processor data bus and can
generate timing ·for almost any alphanumeric screen
density
• Single +5 volt supply, TTL compatibl-e I/O, NMOS
Technology
• Hardware scrolling by page, line or character
• Provides CPU's with synchronous signals to external
device
• Programmabfe cursor format
• Light pen registers and input strobe signal to latch the
light pen position on screen
• Line buffer-less operation. No external DMA required.
Reading screen memory is mutliplexed between CRTC
and CPU
• Programmable interlace or non- interlace scan
• 14-bit wide display memory reading address
General Description
The CRTC UM6845 family are LSI controllers designed
to provide an interface for microcomputers to raster
scan type CRT displays. The CRTC belongs to the
MC 6800 LSI Family and has full compatibility with
CPU in both data lines and control lines. Its primary
function is to generate timing signals which are necessary
for raster-scan type CRT displays according to the speci-
fication programmed by the .cPU.
Pin Configuration
VSS
RES
lPSTB
MAO
MAl
MA2
MA3
MA4
MA5
MA6
MA7
MA8
MAg
MAlO
MAll
MA12
MA13
DISPTMG
CUDISP
VCC
VSYNC
HSYNC
RAO
RAl
RA2
RA3
RA4
DO
Dl
D2
D3
D4
D5
D6
D7
CS
RS
E
R/W
ClK
5-3

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