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PDF D6461 Data sheet ( Hoja de datos )
| Número de pieza | D6461 | |
| Descripción | UPD6461 | |
| Fabricantes | NEC | |
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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
1 page  
BBLK
: Blanking B
BLK1, BLK2: Blanking Output 1, 2
CKOUT
: Clock Output
CLK : Clock Input
CS : Chip Select
DATA
: Data Input
GBLK
: Blanking G
GND
: Ground
Hsync
: Horizontal Synchronous Signal Input
N.C.
: No Connection
OSCIN
: Oscillator Input
OSCOUT : Oscillator Output
PCL : Power-on Clear
RBLK
: Blanking R
TEST
: Test
VB : Character Signal Output
VBLK
: Blanking Signal Output for VR, VG, VB
VC1, VC2 : Character Signal Output 1, 2
VDD : Power Supply
VG : Character Signal Output
VR : Character Signal Output
Vsync
: Vertical Synchronous Signal Input
µPD6461, 6462
5
5 Page 
µPD6461, 6462
1.4 DISPLAY IN RGB+VC1+VC2 MODE
The µPD6461, 6462 provide three options, A, B, and C, for the output distribution format. This section describes how
character signals are output when each option is selected. Output is controlled with the output pin control command (refer
to 3.8 OUTPUT PIN CONTROL COMMAND for details).
Output pin control command for MSB-first transfer (Command bits are input starting from the most significant bit (MSB),
D15.)
(This command is a 2-byte command. 16 bits must be input for each command, even for continuous input.)
(MSB)
(LSB)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
10
01
1
1
0
0
VC2
VC1
0
0 AR3 AR2 AR1 AR0
AR3 AR2
00
00
Row specification bits
AR1 AR0
Function
00
Specifies row 0.
01
Specifies row 1.
10
11
Specifies row 11.
Other values are invalid.
Option A
VC2
0
0
Output pin control bits
VC1 Output from each pin
0 VC1: Outputs a specified row. VC2: Fixed to low level.
1 VC1: Fixed to low level. VC2: Outputs a specified row.
Option B
VC2
0
0
Output pin control bits
VC1 Output from each pin
0 VC1: Outputs all rows. VC2: Fixed to low level.
1 VC1: Outputs all rows. VC2: Outputs a specified row.
Option C
VC2
0
0
1
1
Output pin control bits
VC1 Output from each pin
0 VC1: Outputs columns 0 to 23. VC2: Fixed to low level.
1 VC1: Outputs columns 0 to 11. VC2: Outputs columns 12 to 23.
0 VC1: Outputs columns 12 to 23. VC2: Outputs columns 0 to 11.
1 VC1: Fixed to low level. VC2: Outputs columns 0 to 23.
• Row specification
You can specify whether the VC1 or VC2 pin is used to output the character signals for each row (or each 12 columns).
• Output pin control
The signals output from the VC1 and VC2 pins depend on whether option A, B, or C is selected (the corresponding
blanking signals are output in the same way).
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet D6461.PDF ] | |
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