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Número de pieza | LC74751 | |
Descripción | On-Screen Display LSI | |
Fabricantes | Sanyo Semicon Device | |
Logotipo | ||
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No Preview Available ! Ordering number : EN*5396
CMOS LSI
LC74751
On-Screen Display LSI
Preliminary
Overview
The LC74751 is a CMOS LSI that supports on-screen
display of characters and patterns on a TV screen under
the control of a microcontroller. The LC74751 includes an
on-chip character ROM that provides 128 characters in a
12 × 18 dot format. This IC supports display of up to 12
lines of 24 characters each for a maximum of 288
characters.
Features
• Display format: 24 characters by 12 rows
• Characters displayed: Up to 288 characters
• Display control ROM (line ROM): ROM for 64 lines
(Control in line units: lines consisting of 24 characters)
• Display RAM: 176 characters (Used for the specification
of user-defined characters.)
• Character format: 12 (horizontal) × 18 (vertical) dots
• Characters in font: 128
• Character sizes: Four sizes each in the horizontal and
vertical directions
• Initial display positions: 64 horizontal positions and 64
vertical positions
• Blinking: Specifiable in character units
• Blinking types:
— Two periods supported: 1.0 second and 0.5 second
— Three duty types supported: 25%, 50%, and 75%
• Blanking: Over the whole font (12 × 18 dots)
• Background color
— 8 background colors (in internal synchronization
mode): 4fsc (NTSC/PAL/PAL-M/PAL-N)
— 4 background colors (in internal synchronization
mode): 2fsc (NTSC)
— Single background color (blue) (in internal
synchronization mode): 2fsc (PAL/PAL-M/PAL-N)
• External control input: Serial data input
• Synchronizing signals: Supports switching between
internal and external synchronizing signals.
• On-chip sync separator circuit
• Video output: Composite video output in the NTSC,
PAL, PAL-M, or PAL-N format
• Superimpose function: Superimposes the character
output on the composite video output.
Package Dimensions
unit: mm
3059-DIP22S
[LC74751]
SANYO: DIP22S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83096HA (OT) No. 5396-1/15
1 page System Block Diagram
LC74751
Display Screen Structure
The display mode has a 24-character by 12-row format.
The maximum number of characters that can be displayed is 288.
When character sizes are enlarged, the maximum number of characters that can be displayed is reduced.
Display ROM (12-line specification) and display RAM (for 176 characters)
• Specify fixed characters in the display line ROM.
• Application programs use the display RAM to specify characters for sections of the display in which the characters
change.
No. 5396-5/15
5 Page LC74751
Memory (Display ROM) Organization
This memory has addresses ranging from 0 (000 hexadecimal) to 1535 (5FF hexadecimal).
Data has 8 bits.
Bit DA DA DA DA DA DA DA DA DA DA DA DA DA DA DA DA
Address F E D C B A 9 8 7 6 5 4 3 2 1 0
Notes
000
ROM/
Line ROM: First character in the
(000h)
0
0
0
0
0
0
0
0 RAM ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 first line
0023
ROM/
Line ROM: 24th character in the
(017h)
0
0
0
0
0
0
0
0 RAM ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 first line
0024
ROM/
Line ROM: First character in the
(018h)
0
0
0
0
0
0
0
0 RAM ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 second line
ROM/
RAM
Character code
1535
ROM/
Line ROM: 24th character in the
(5FFh)
0
0
0
0
0
0
0
0 RAM ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 64th line
DA
0 to 8
0
1
2
3
4
5
6
7
Register
ADR0
ADR1
ADR2
ADR3
ADR4
ADR5
ADR6
ROM/
RAM
Contents
State
Function
0 Specifies an address in character ROM.
When specifying display control RAM, DA7 must be set to 1 and ADR0 to
1 ADR6 must be set to 0.
0 The address specification range for character ROM is 0 to 127 (7F
hexadecimal).
1
0
1
0
1
0
1
0
1
0
1
0 Data is read directly from character ROM.
1 Data is read from character ROM through RAM.
Notes
No. 5396-11/15
11 Page |
Páginas | Total 15 Páginas | |
PDF Descargar | [ Datasheet LC74751.PDF ] |
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