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PDF LC74761M Data sheet ( Hoja de datos )
| Número de pieza | LC74761M | |
| Descripción | On-Screen Display LSI | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number :EN4846A
CMOS IC
LC74761, 74761M
On-Screen Display LSI
Overview
The LC74761 and LC74761M are on-screen display
CMOS LSIs that superimpose text and low-level graphics
onto a TV screen (video signal) under microcontroller.
The display characters have a 12 by 18 dots structure, and
256 characters are provided.
Features
• Display structure: 12 lines by 24 characters (up to 288
characters)
• Maximum character display: Up to 288 characters
• Character configuration: 12 (W) by 18 (H) dots structure
• Number of characters: 256 characters (254 plus space 1
font and transparent space 1 font)
• Character sizes: Three sizes (normal, double, and triple
sizes)
• Display starting positions: 64 horizontal and 64 vertical
locations
• Reverse video function: Characters can be inverted on a
per character basis.
• Flashing types: Two types with periods of 0.5 and 1.0
second on a per character basis (duty fixed at 50%)
• Background color: One of eight colors (when internal
synchronization used)
• External control input: Serial data input in 8-bit units
• Built-in horizontal/vertical sync separation circuit, AFC
circuit, and synchronization detector
• Video output: Composite video signal output in NTSC,
PAL, PAL-M, PAL-N, PAL60, NTSC4.43, or SECAM
format
Package Dimensions
unit: mm
3196-DIP30SD
[LC74761]
unit: mm
3216A-MFP30S
[LC74761M]
SANYO: DIP30SD
SANYO: MFP30S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
13096HA (OT)/N2894TH (OT) No. 4846-1/20
1 page  
System Block Diagram
LC74761, 74761M
No. 4846-5/20
5 Page 
LC74761, 74761M
Second byte
DA0 to DA7
7
6
5
Register name
—
TST
CHAL
State
0
0
1
0
1
0
4 BKL
1
Register content
Function
Second byte identification code
Normal operation
Test mode
Sets the character intensity level to about 85 IRE (bright white).
Sets the character intensity level to about 72 IRE (white with a
touch of grey).
Sets the blanking intensity level to about 3 IRE (a deep black
as a frame level).
Sets the blanking intensity level to about 13 IRE (a dark grey
as a frame level).
0
RSL1
RSL0
Intensity level
Amplitude
3
RSL1
1
0
0
About 15 IRE
About 60 IRE
0
1
About 30 IRE
About 60 IRE
0
1
0
About 45 IRE
About 60 IRE
2 RSL0
1
1
1
About 55 IRE
About 65 IRE
0 Normal CVout output
1 CVoutmt
1 CVout pedestal level output
0 Selects XTAL1
0 XTALsel
1 Selects XTAL2
Note: When the chip is reset by the RST pin, the register states (bits) are all cleared to 0.
Note
Test mode should not be used. This bit
should always be zero.
Switches the character intensity level.
Switches the blanking intensity level.
Switches the background intensity level.
Switches the oscillator circuit
7 COMMAND6: Display Control Setting Command 3
First byte
DA0 to DA7
7
6
5
4
3
2
1
0
Register name
—
—
—
—
MOD3
MOD2
MOD1
MOD0
State
1
1
1
0
0
1
0
1
0
1
0
1
Register content
Function
The command 6 identification code:
sets display control parameters.
Sets Fsc to 3.58 MHz.
Sets Fsc to 4.43 MHz.
Sets the color mode to NTSC.
Sets the color mode to PAL.
Sets the number of scan lines to 525 lines.
Sets the number of scan lines to 625 lines.
Sets the mode to a mode other than SECAM.
Sets the mode to SECAM mode.
Note
The logical or of this bit and the Fsc
switching input pin (pin 14) is used.
The logical or of this bit and the color
mode switching input pin (pin 13) is
used.
The logical or of this bit and the scan
line count switching input pin (pin 12) is
used.
The logical or of this bit and the mode
switching input pin (pin 11) is used.
No. 4846-11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LC74761M.PDF ] | |
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