LC74785/M
Overview
The LC74785 and LC74785M are integrated EDS
LC74789/M/JM
Overview
The LC74789, LC74789M, and LC74789JM are
Functions
Display structure: 12 lines 24 characters (up to 288 characters)
Character structure: 12 18 dots (H V)
Character sizes: Three sizes in each of the horizontal and vertical directions
Number of characters: 128 characters
Display start positions: Horizontal: 64 positions, vertical: 64 positions
Blinking: Specified in horizontal units
Types of blinking: Two: periods of 1.0 and 0.5 seconds
Blinking of the whole character area (12 18 dots)
Background color: 8 colors (internal synchronization operation) at 4 fsc 6 colors (internal synchronization operation) at 2 fsc
Line background color: Can be set for up to 3 lines
Line background color: 8 colors (internal synchronization operation) at 4 fsc
Line background color: 6 colors (internal synchronization operation) at 2 fsc 
External control input:
EDS support
Video input: NTSC composite video signal 
Packages: LC74785: DIP24S (300mil)
LC74785M: MFP24 (375mil)
Functions
Display structure: 12 lines 24 characters (up to 288 characters)
Character structure: 12 18 dots (H V)
Character size: Three sizes in each of the horizontal and vertical directions
Number of characters: 256 characters (254 characters, one space character, one transparent space character)
Display start positions: Horizontal: 64 positions, vertical: 64 positions
Blinking: Specified in horizontal units
Types of blinking: Two: periods of 1.0 and 0.5 seconds
Blinking of the whole character area (12 18 dots)
Background color: 8 colors (internal synchronization operation) at both 2 and 4 fsc
Line background color: Can be set for up to 3 lines
Line background color: 8 colors (internal synchronization operation) at both 2 and 4 fsc 
External control input:
Video signal inputs: NTSC, PAL, 
Packages: LC74789: DIP24S (300mil), LC74789M: MFP24 (375mil), LC74789JM: MFP24S (300mil)
Block Diagram
Block Diagram
CS1 
SIN 
SCLK 
CPDT 
CS2 
LN21 
Data output
buffe
Serial |
|
|
|
|
|
|
| |
parallel | + |
|
|
|
|
|
|
|
command |
|
|
|
|
|
|
| |
converter | decoder | Horizontal | Vertical | Horizontal | Vertical | Blinking | Display | RAM |
|
| direction | direction | display | display | and | write | |
|
| inversion | control | |||||
|
| character | character | position | position | address | ||
|
| control | register | |||||
Output control |
| size register | size register | register | register | register | counter | |
|
|
|
|
| Horizontal |
|
| Vertical |
| Horizontal |
| Vertical |
| Blinking |
|
|
|
| Decoder |
|
|
| |||
DATA SLICER |
| size |
|
|
|
| size |
|
| dot |
| dot |
| and |
|
|
|
|
|
|
| Display RAM | |
| counter |
|
| counter |
| counter |
| counter |
| inversion |
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| control |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| circuit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CS | Serial |
|
|
|
|
|
| |
|
|
|
|
|
|
| ||
SIN | parallel | + |
|
|
|
|
|
|
| command |
|
|
|
|
|
| |
SCLK | converter | decoder |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
| Horizontal | Vertical | Horizontal | Vertical | Blinking | Display | RAM write |
|
| direction | direction | display | display | and | ||
RST |
| control | address | |||||
| character | character | position | position | inversion | |||
|
| register | counter | |||||
|
| size register | size register | register | register | control register | ||
VDD1 |
|
|
|
|
|
|
|
|
| Horizontal |
| Vertical size |
| Horizontal |
| Vertical dot | Blinking and |
| Decoder |
|
|
VSS1 | size counter |
| counter |
| dot counter |
| counter | inversion |
|
| Display RAM | |
|
| |||||||||||
|
|
|
|
|
|
|
| control circuit |
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
VDD1 
VSS1 
VDD2 
VSS2 
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SYNCJDG |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Sync |
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| discriminator |
| |||
|
| DATA |
|
|
|
| HSYNC |
|
|
|
|
|
|
|
|
|
|
|
| |||
|
| peak hold |
|
| peak hold |
|
|
|
|
|
| Composite |
| |||||||||
|
|
|
|
|
|
|
|
|
| sync signal |
|
| ||||||||||
|
| (slicer) circuit |
|
| (slicer) circuit |
|
|
|
|
| ||||||||||||
|
|
|
|
|
|
|
| |||||||||||||||
|
|
|
|
|
|
| separator |
|
| |||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| control |
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Pedestal clamp |
|
|
|
|
|
|
|
| Character |
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
| output dot |
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
| clock generator |
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Horizontal | Vertical |
display | display |
position | position |
detection | detection |
Character | Line |
control | control |
counter | counter |
Timing generator |
|
|
| Sync signal |
| Character output control |
|
|
| ||||
|
|
|
| Background control | ||
|
|
| generator |
| ||
|
|
|
|
| Video output control | |
|
|
|
|
|
|
Decoder
Font ROM
Shift register
VDD2 |
| Horizontal display | Vertical display |
|
|
VSS2 |
| position detection | position detection |
| Decoder |
|
|
|
| ||
SYNCJDG | Sync | Character | Line control |
|
|
discriminator | control |
|
| ||
|
| counter | counter |
| Font ROM |
|
|
|
| ||
OSCIN | Character |
|
|
| |
|
|
|
| ||
| output dot |
|
|
|
|
| clock |
|
|
|
|
OSCOUT | generator |
|
| Character output control |
|
| Timing generator | Sync signal generator | Shift register | ||
| Background control | ||||
|
|
|
|
| |
SYNIN | Sync | Composite sync | |
SEPC | |||
signal separator | |||
discriminator | |||
SEPOUT | control | ||
| |||
SEPIN |
|
|
|
|
| XtalIN | COLR CVIN CVOUT |
SYNIN | RST SEPOUT OSCIN OSCOUT SEPIN | |||
|
| CTRL1 | XtalOUT | |
|
| (CHABLK) | (MUTE) | |
CTRL1 | XtalIN XtalOUT | HFTONOUT | CVCR CVOUT | |
(CHABLK) | (MUTE) | COLR | CVIN | |
57 SANYO TV . VCR | SANYO TV . VCR 58 |
