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부품번호 | UM6845R 기능 |
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기능 | CRT Controller | ||
제조업체 | UMC | ||
로고 | |||
·@)UMC
UM6845R/UM6845RA/UM6845RB
==::::====::::==::::::::::::::::CRT Conuoner
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
• Compatible with SY6845R
• Straight-binary addressing for Video Display RAM
General Description
The UM6845R is a CRT Controller intended to provide
capability for interfacing any 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/MA1
CC2/MA2
CC3/MA3
CC4/MA4
CC5/MA5
CC6/MA6
CC7/MA7
CRO/MA8
CR1/MA9
CR2/MA10
CR3/MA11
CR4/MA12
CR5/MA13
DISPLAY ENABLE
CURSOR
Vce
Block Diagram
VSYNC
HSYNC
RAO
RA1
RA2
RA3
RA4
DBO
DB1
DB2
DB3
DB4
DB5
DB6
DB7
CS
RS
E
R/W
CCLK
VCC GND
DBO-DB7
HSYNC
1 - - - - VSYNC
t---- DISPLAY ENABLE
R/!-~-+I UM6845R CRTC
CURSOR
t _ _ - - LPEN
CS ....._ _ CCLK
RS t _ _ - - RES
MAO-MA13 RAO-RA4
\{
VIDEO D.lSPLAY RAM AND CHARACTER RoM
5-26
UM6845R / UM6845RA / UM6845RB
MEMORY AND VIDEO INTERFACE CHARACTERISTICS
(Vcc = 5.0V ± 5%, T A = 0 to 70°C, unless otherwise noted)
tCCH
MAO-MA13 ________________-+____-J
RAO-RA4
DISPLAY ENABLE ________________-+______-J
HSYNC, VSYNC ________________-+______--J
CURSOR ________________-+________J
Symbol
TCCH
TCCY
Tr , tt
tMAO
tRAO
tOTO
tHSD
tvso
tcoo
Parameter
Minimum Clock Pulse Width, High
Clock Frequency
Rise and Fall Time for Clock Input
Memory Address Delay Time
Raster Address Delay Time
Display Timing Delay Time
Horizontal Sync Delay Time
Vertical Sync Delay Time
Cursor Display Timing Delay Time
Min.
200
Typ.
100
100
160
160
160
160
Max.
2.5
20
160
160
300
300
300
300
Units
ns
MHz
ns
ns
ns
ns
ns
ns
ns
LIGHT PEN STROBE TIMING
NOTE:
"Safe" time position for
LPEN positive edge to
cause address n+2 to load
into Light Pen Register.
tLP2 and tLP1 are time
positions causing uncertain
results.
CCLK
LPEN~~
X"'__ X"'___ x==MAO-MA13 ___n____-J
n_+_1_ _-J
n_+_2____...
Symbol
Characteristics
tLPH
tLP1
tLP2
lPEN Strobe Width
lPEN to CClK Delay
CClK to lPEN Delay
tr and tf = 20 ns (max.)
UM6845R
Min.
Max.
100 -
- 120
-0
UM6845RA
Min.
Max.
100 -
- 120
-0
UM6845RB
Min.
Max.
100 -
- 120
-0
Unit
ns
ns
ns
5-29
4페이지 UM6845R / UM6845RA / UM6845RB
1 COMPLETE FIELD (VERTICAL TOTAL)
VERTICAL DISPLAYED
DISPLAY
ENBALE
HSYNC
VSYNC
~------------------~--~--------------------------~
DISPLAY
ENABLE
HSYNC
_
_
_
_+
-______________________________
~----~
RAO-RA4 ___'1'-___________________________________________ 1...._
Figure 2. Vertical and Horizontal Timing
Mode Control (RS)
This register is used to select the operating modes of the
UM6845R and is outlined as-follows:
Scan Line (R9)
This 5-bit register contains the number of scan lines per
character row, including sp,ing minus one.
Cursor Start (R10) and Cursor End (R11)
These 5-bit registers select the starting and ending scan
lines for the cursor. In addition, bits 5 and 6 of R10 are
used to select the cursor mode, as follows:
BIT
-,--
OPERATION
Non-Interlace
Interlace SYNC Raster Scan
Interlace SYNC and Video Raster Scan
BIT
65
00
01
10
11
CURSOR MODE
No Blinking
No Cursor
BIink at 16 x field period
Blink at 32 x field period
5-32
7페이지 | |||
구 성 | 총 13 페이지수 | ||
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |