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D6461 Schematic ( PDF Datasheet ) - NEC

Teilenummer D6461
Beschreibung UPD6461
Hersteller NEC
Logo NEC Logo 




Gesamt 30 Seiten
D6461 Datasheet, Funktion
DATA SHEET
MOS INTEGRATED CIRCUIT
µPD6461, 6462
CMOS LSI CHIP FOR CAMCORDER ON-SCREEN CHARACTER DISPLAY
(12 ROWS × 24 COLUMNS)
The µPD6461, 6462 are CMOS LSI chips designed to provide on-screen character display for camcorders. When
combined with a microcontroller, the µPD6461, 6462 control the display of the characters displayed in the viewfinder (count,
time, date, etc.) and the recording of characters onto video tape (time, date, etc.).
Each character is created using 12 (width) × 18 (height) dots. Kanji characters and graphic symbols can also be displayed
by using two or more characters. The µPD6461, 6462 are compatible with color viewfinders and can output character signals
to three channels, the RGB channel for the color viewfinder and the VC1 and VC2 channels for the recording system and
monitor terminal.
The µPD6461, 6462 also have a power-on clear function and video RAM batch clear command, enabling the number
of operations assigned to the microcontroller to be reduced.
FEATURES
• Maximum number of characters: 12 rows × 24 columns (288 characters)
• Number of character patterns : 256 (µPD6461)/128 (µPD6462) (stored in ROM). Each pattern can be changed by
specifying a mask code option.
• Character size
: One dot per line or one dot per two lines (field)
• Number of character colors : 8
• Background
: No background, minimum background, or overall background can be selected for the
entire screen, together with rimming ON/OFF function. Any one of 8 different colors
is selectable as the background color and together with the rim color (black or white)
selectable per screen.
• Dot matrix
: Each character consists of 12 (width) × 18 (height) dots. There is no gap between
adjacent characters.
• Blinking
: Blinking can be turned on/off for each character. The blinking ratio is 1:1. The blinking
frequency can be selected from approx. 1 Hz, 2 Hz, and 0.5 Hz for the entire screen.
• Reversed characters
: Specified characters can be displayed in reverse video.
• Character signal output
: Character signals can be output to three channels. Output mode (1) (RGB + BLK, VC1
+ VBLK1, and VC2 + VBLK2) or output mode (2) (R + RBLK, B + BBLK, and G + GBLK) can
be selected by specifying a mask option. For output mode 1, three output formats are
available for the VC1 and VC2 channels (options A, B, and C).
• Clearing of video RAM
: Video RAM batch clear command and power-on clear function
• Interface with a microcontroller : 8-bit serial input supporting variable word length (LSB first or MSB first can be selected
by specifying a mask option.)
• Supply voltage
: Low-voltage operation possible (supply voltage range: 2.7 to 5.5 V)
The information in this document is subject to change without notice.
Document No. S13320EJ1V1DS00 (1st edition)
Date Published November 1998 N CP(K)
Printed in Japan
The mark shows major revised points.
© 1998






D6461 Datasheet, Funktion
µPD6461, 6462
PIN FUNCTIONS
Pin No.Note 1 SymbolNote 2
FunctionNote 2
1
CLK
Clock input
2
3 (4)
CS
DATA
Chip select input
Serial data input
4 (5)
PCL
Power-on clear
5 (6)
6 (7)
7 (8)
8 (9)
VDD
CKOUT
OSCOUT
OSCIN
Power supply
Clock output
LC oscillator input/
output
OSCIN: External clock
input
9 (10)
TEST Test pin
10 (11)
11 (14)
GND
BLK1
Ground pin
Blanking signal output 1
12 (15)
13 (16)
VC1 Character signal output
1
BLK2
(RBLK)
Blanking signal output 2
(blanking R)
14 (17)
15 (18)
VC2
(GBLK)
VBLK
(BBLK)
Character signal output
2
(blanking G)
Blanking signal output
(blanking B)
16 (19)
17 (20)
18 (21)
19 (23)
VR
VG
VB
Vsync
20 (24)
Hsync
(3, 12, 13, 22) N.C.
Character signal output
Vertical synchronizing
signal input
Horizontal synchroniz-
ing signal input
No connection
Description
Input pin for the data read clock. The data input to the DATA pin is read at
rising edges of the clock.
Serial transfer is accepted when this pin is low.
Input pin for control data. Data is read in synchronization with the clock input
to the CLK pin.
Pin used for the power-on clear function. After power-on, set this pin from low
to high to initialize the IC.
Power supply pin
N-ch open-drain output pin used to check the oscillation frequency
Input and output pins for the oscillator for generating a dot clock. Connect
the oscillation coil and capacitors to these pins.
(When an external clock input is selected by specifying a mask option, input
an external clock (synchronized with Hsync) to the OSCIN pin. Leave the
OSCOUT pin open.)
Pin used for testing the IC. Usually, connect this pin to ground. The IC cannot
enter test mode while this pin is connected to ground.
Connect this pin to the system ground.
Pin used to output the blanking signal for the video signal output from the VC1
pin. The blanking signal is high active.
(When RGB compatible blanking has been selected by specifying a mask
option, this pin outputs the logical OR of RBLK, GBLK, and BBLK.)
Pin used to output a high-active character signal.
(When RGB compatible blanking has been selected by specifying a mask
option, this pin outputs the logical OR of VR, VG, and VB.)
Pin used to output the blanking signal for the video signal output from the VC2
pin. The blanking signal is high active.
(This pin outputs the blanking signal for the video signal output from the VR
pin. The blanking signal is high active.)
Pin used to output a high-active character signal.
(This pin outputs the blanking signal for the video signal output from the VG
pin. The blanking signal is high active.)
Pin used to output the blanking signal for the video signals output from the
VR, VG, and VB pins. The blanking signal is high active.
(This pin outputs the blanking signal for the video signal output from the VB
pin. The blanking signal is high active.)
Pins used to output high-active character signals.
Input a low-active vertical synchronizing signal to this pin.
Input a low-active horizontal synchronizing signal to this pin.
Vacant pin
Notes 1. Pin numbers indicated in ( ) are that of the µPD6461GT-xxx.
2. Signals in ( ) are set by a mask option (RGB + RGB compatible blanking).
6

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D6461 pdf, datenblatt
µPD6461, 6462
Option A output
Output pin control bits
VC2
VC1
Output from each pin
0 0 VC1: Outputs the specified row. VC2: Fixed to low level.
0 1 VC1: Fixed to low level. VC2: Outputs specified row.
(1)
(2)
For case
(1) above
For case
(2) above
Output
channel
VC1 channel
VC2 channel
VC1 channel
VC2 channel
Character signal
Outputs the logical OR of the character signals at
the VR, VG, and VB pins (for the specified rows),
excluding those characters for which the VC2 chan-
nel has been specified.
Fixed to low level (for the specified rows)
Fixed to low level (for the specified rows)
Outputs those characters for which the VC2 chan-
nel has been specified (for the specified rows).
Background signal (if specified)
Outputs a background signal for areas other than
those for which the VC2 channel has been specified.
Outputs a background signal for those the areas for
which the VC2 channel has been specified.
Outputs a background signal for areas other than those
for which the VC2 channel has been specified.
Outputs a background signal for those the areas for
which the VC2 channel has been specified.
Option B output
Output pin control bits
VC2
VC1
Output from each pin
0 0 VC1: Outputs all rows. VC2: Fixed to low level.
0 1 VC1: Outputs all rows. VC2: Outputs a specified row.
(1)
(2)
For case
(1) above
For case
(2) above
Output
channel
VC1 channel
VC2 channel
VC1 channel
VC2 channel
Character signal
Outputs the logical OR of the character signals at
the VR, VG, and VB pins (for all rows), excluding
those characters for which the VC2 channel has
been specified.
Fixed to low level (for the specified rows)
Outputs the logical OR of the character signals at
the VR, VG, and VB pins (for all rows), excluding
those characters for which the VC2 channel has
been specified.
Outputs the characters for which the VC2 channel
is specified (for the specified rows).
Background signal (if specified)
Outputs a background signal for areas other than
those for which the VC2 channel has been specified.
Outputs a background signal for those areas for
which the VC2 channel has been specified.
Outputs a background signal for areas other than
those for which the VC2 channel has been specified.
Outputs a background signal for those areas for
which the VC2 channel has been specified.
12

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