DataSheet.jp

UM6845E の電気的特性と機能

UM6845EのメーカーはUMCです、この部品の機能は「CRT Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 UM6845E
部品説明 CRT Controller
メーカ UMC
ロゴ UMC ロゴ 




このページの下部にプレビューとUM6845Eダウンロード(pdfファイル)リンクがあります。
Total 17 pages

No Preview Available !

UM6845E Datasheet, UM6845E PDF,ピン配置, 機能
(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

1 Page





UM6845E pdf, ピン配列
MPU Bus Interface Characteristics
WRITE CYCLE
UM6845E / UM6845EA / UM6845EB
READ CYCLE
E
RS
es, R/iN
DATA BUS
E
RS
es, R/W
DATA BUS
Write Timing Characteristics (Vee = 5.0V ± 5%, TA = 0 - 70°C, unless otherwise noted)
Symbol
Characteristics
tCYC
Cycle Time
PWEH
E Pulse Width, High
PWEL
E Pulse Width, Low
tAS Address Set- Up Time
tAH Address Hold Time
tcs R/W, CS Set· Up Time
tCH R/W, CS Hold Time
tDSW
Data Bus Set - Up Time
tDHW
Data Bus Hold Time
(tr and tf = 10 to 30 ns)
UM6845E
Min. Max.
1.0 -
440 -
420 -
80 -
0-
80 -
0-
165 -
10 -
UM6845EA
Min. Max.
0.5 -
200 -
190 -
40 -
0-
40 -
0-
60 -
10 -
UM6845EB
Min. Max.
0.33
-
150 -
140 -
30 -
0-
30 -
0-
60 -
10 -
Read Timing Characteristics (Vee = 5.0V ± 5%, TA = 0 - 70°C, unless otherwise noted)
Symbol
Characteristics
tCYC
PWEH
PWEL
tAS
tAH
tcs
tDDR
tDHR
tDA
tTAD
Cycle Time
ct>2 Pulse Width, High
ct>2 Pulse Width, Low
Address Set- Up Time
Address Hold Time
R/W, CS Set-Up Time
Read Access Time (Valid Data)'
Read Ho Id Time
Data Bus Active Time (I nvalid Data)
MAO-MA13 Switching Delay
(Refer to Figure Trans. Addressing)
(t r and tf = 10 to 30 ns)
UM6845E
Min. Max.
1.0 -
440 -
420 -
80 -
0-
80 -
- 290
10 -
20 60
100
160
typo
UM6845EA
Min. Max.
0.5 -
200 -
190 -
40 -
0-
40 -
- 150
10 -
20 60
100
160
typo
UM6845EB
Min. Max.
0.33
-
150 -
140 -
30 -
0-
30 -
- 100
10 60
20 60
90
130
typo
Units
/1S
ns
ns
ns
ns
ns
ns
ns
ns
Units
/ls
ns
ns
ns
ns
ns
ns
ns
ns
ns
5-41


3Pages


UM6845E 電子部品, 半導体
UM6845E / UM6845EA / UM6845EB
RAO-RA4 (Raster Address Lines)
These signals are active-h igh outputs and are used to select
each raster scan within an individual character row. The
number of raster scan Iines is programmable and determines
the character height, including spaces between character
rows.
The high-order line, RA4, is unique in that it can also
function as a strobe output pin when the UM6845E is
programmed to operate in the "Transparent Address
Mode". In this case the strobe is an active-high output
and is true at the time the Video Display RAM update
address is gated on to the address lines, MAO-MA 13. In
this way, updates and readouts of the Video Display
RAM can be made under control of the UM6845E with
only a small amount of external circuitry.
Description of Internal Registers
Figure 1 illustrates the format of a typical video display
and is necessary to understand the functions of the various
UM6845E internal registers. Figure 2 illustrates vertical
and horizontal timing. Figure 3 summarizes the internal
registers and indicates their address selection and read/
write capabilities.
Address Register
This is a 5-bit register which is used as a "pointer" to direct
UM6845E data transfers to and from the system MPU.
Its contents is the number of the .desired register (0-31).
When RS is low, then this register may be loaded; when
RS is high, then the register sel~cted is the one whose
identity is stored in th is register.
HaRT TOTAL
HOR DISPLAYED
II
A B C 0 E FGH I J K L
MN oP
] t7~~
VERT
TOTAL
VERT
DISPLAYED
r .......
I :;;:;
~:;;:; ~J
~
NUMBER OF
SCAN LINES
JPER
CHARACTER
ROW
VERT
] TOTAL
ADJUST
Figure 1. Video Display Format
Status Register
This 3-bit register is used to monitor the status of the
CRTC, as follows:
Horizontal Total (RO)
This 8-bit register contains the total of displayed and
non-displayed characters, minus one, per horizontal line.
The frequency of HSYNC is thus determined by this
register.
VERTICAL BLANKING
"0" Scan currently not in vertical blanking
portion of its timing
"1" Scan currently is in its vertical blanking
time.
1...-_ _ _ LPEN REGISTER FULL
"9" This bit goes to "0" whenever either
register R16 or R17 is read by the MPU.
"1" This bit goes to ':1" whenever a LPEN
strobe occurs.
'------ UPDATE READY
"0" This bit goes to "0" when register R31
has been either read or written by the
MPU.
"1" This bit goes to "1" when an Update
Strobe occurs.
Horizontal Displayed (R1)
This 8-bit register contains the number of displayed
characters per horizontal line.
Horizontal Sync Position (R2)
This 8-bit register contains the position of the HSYNC
on the horizontal line, in terms of the character location
number on the line. The position of the HSYNC deter-
mines the left-to-right location of the displayed text
on the video screen. In th is way, the side margins are
adjusted.
5-44

6 Page



ページ 合計 : 17 ページ
 
PDF
ダウンロード
[ UM6845E データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
UM6845

CRT Controller

UMC
UMC
UM6845A

CRT Controller

UMC
UMC
UM6845B

CRT Controller

UMC
UMC
UM6845E

CRT Controller

UMC
UMC


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap