Sanyo EP58B specifications LC74776/M, LC74793/JM

On-Screen Display Controller IC

LC74776/M

Overview

The LC74776 and LC74776M are integrated PDC/VPS/UDT interface circuit on-screen display CMOS ICs that display text and patterns on the TV screen under control of a microcontroller.

The LC74776 and LC74776M display 12 18 dot characters in a display area of 12 lines by 24 columns.

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: 256 characters (256 characters, one space character, one transparent space character)

Display start positions: Horizontal: 64 positions, vertical: 64 positions

Blinking: Specified in character 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 Blue background only: NTSC

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: 8-bit serial interface

Built-in sync separator circuit

Video signal input: PAL or NTSC composite video signal

Built-in PDC/VPS/UDT interface (I2C bus support) Packages: LC74776: DIP30SD (400mil)

LC74776M: MFP30S (375mil)

				Block Diagram
CS	Serial	8-bit latch
SIN
		+
SCLK	parallel	command
	converter	decoder
SRT			Horizontal	Vertical	Horizontal		Vertical	Blinking	Display	RAM write
	Data output	Output	direction	direction	display		display	and	control	address
			character	character	position		position	inversion
	buffer	control	size register	size register	register		register	control	register	counter
SLC								register
SDA			Horizontal	Vertical size	Horizontal	Vertical dot		Blinking and		Decoder
CPOUT								inversion
	AFC	Data slicer	size counter	counter	dot counter		counter				Display RAM
								control circuit
VCOIN	circuit	circuit
VCOR				Horizontal display		Vertical display
				position detection		position detection					Decoder
SYNCJDG		Sync			Character
		discriminator				Line control
					control		counter				Font ROM
OSCIN	Character				counter
	output dot
	clock
OSCOUT	generator							Character output control
											Shift register
			Timing generator		Sync signal generator			Background control
SYNIN	Sync	Composite						Video output control
SEPC	separator	sync signal
	and data	separator
SEPOUT	separator	control
	circuit
	VDD1 VDD2 VDD3	VSS1 VSS2 VSS3			CTRL1	XtalIN	XtalOUT	CVCR CDLR	CVIN CVOUT
					(CHABLK)		(MUTE)

VPS/PDC Slicer IC

LC74793/JM

Overview

The LC74793 and LC74793JM are PDC/VPS/UDT interface CMOS ICs. The operating mode can be set and the data acquired in the various modes can be read out by a microcontroller.

Functions

VPS data acquisition (bytes 5 and 11 to 15)

VPS: Video Program System

PDC (8/30/2) data acquisition (bytes 13 to 25)

PDC: Program Delivery Control

UDT (8/30/1) data acquisition (bytes 13 to 25)

UDT: Unified Date and Time

Header (X/00) data acquisition (bytes 14 to 45)

Status display (8/30/1, 8/30/2) data acquisition (bytes 26 to 45)

Automatic VPS/PDC discrimination mode

Sync separator and AFC circuits

Sync discrimination circuit

I2C bus support

Packages: LC74793: DIP24S (300mil)

LC74793JM: MFP24S (300mil)

		Block Diagram
SDA	I2C bus interface	Data latch circuit
SCL
DAV
SYNIN	Sync separator		Data acquisition circuit
	and data separator
SEPC	circuits
SEPOUT
SEPIN		Vertical
		separation
CTRL2		circuit	AFC circuit (VCO)
						Timing generator
		Sync
VDD1,2		discrimination
		circuit
VSS1,2
		SYNCJDG	CPOUT VCOIN VCOR HOUT	VOUT	XIN	XOUT	CTRL1	CDLR	RST

59 SANYO TV . VCR SANYO TV . VCR 60