DATA SHEET
µ
PD6461, 6462
CMOS LSI CHIP FOR CAMCORDER ON-SCREEN CHARACTER DISPLAY
(12 ROWS
×
24 COLUMNS)
MOS INTEGRATED CIRCUIT
The
µ
PD6461, 6462 are CMOS LSI chips designed to provide on-screen character display for camcorders. When
combined with a microcontroller, the
µ
PD6461, 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
µ
PD6461, 6462 are compatible with color viewfinders and can output character signals
to three channels, the RGB channel for the color viewfinder and the V
C1
and V
C2
channels for the recording system and
monitor terminal.
The
µ
PD6461, 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 (
µ
PD6461)/128 (
µ
PD6462) (stored in ROM). Each pattern can be changed by
specifying a mask code option.
• Character size
• Number of character colors
• Background
: One dot per line or one dot per two lines (field)
: 8
: 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
• Blinking
• Reversed characters
• Character signal output
: Each character consists of 12 (width)
×
18 (height) dots. There is no gap between
adjacent characters.
: 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.
: Specified characters can be displayed in reverse video.
: Character signals can be output to three channels. Output mode (1) (RGB + BLK, V
C1
+ V
BLK1
, and V
C2
+ V
BLK2
) or output mode (2) (R + R
BLK
, B + B
BLK
, and G + G
BLK
) can
be selected by specifying a mask option. For output mode 1, three output formats are
available for the V
C1
and V
C2
channels (options A, B, and C).
• Clearing of video RAM
: Video RAM batch clear command and power-on clear function
by specifying a mask option.)
• Supply voltage
: Low-voltage operation possible (supply voltage range: 2.7 to 5.5 V)
• Interface with a microcontroller : 8-bit serial input supporting variable word length (LSB first or MSB first can be selected
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
µ
PD6461, 6462
ORDERING INFORMATION
Part number
Package
20-pin plastic shrink SOP (300 mil)
24-pin plastic SOP (375 mil)
20-pin plastic shrink SOP (300 mil)
µ
PD6461GS-xxx
µ
PD6461GT-xxx
µ
PD6462GS-xxx
Remarks 1.
xxx is a ROM code suffix.
2.
NEC’s standard models are the
µ
PD6461GS-101/102,
µ
PD6462GS-001. For the details of the
character generator ROM, refer to
5. CHARACTER PATTERNS.
µ
PD6461GS-101: MSB first/Specified in three-line units/RGB+3BLK/Option B/LC oscillation
µ
PD6461GS-102: MSB first/Specified in three-line units/RGB+V
C1
+V
C2
/Option B/LC oscillation
µ
PD6462GS-001: MSB first/Specified in three-line units/RGB+V
C1
+V
C2
/Option C/LC oscillation
2
BLOCK DIAGRAM
TEST
V
DD
Data input shift
register
Instruction decoder
Control signals
GND
PCL
CS
Horizontal address
register for
display position
DATA
CLK
Character size
register
Write address
counter
Video RAM
Data selector
CK
OUT
Horizontal size
counter
Horizontal
position counter
Horizontal address
counter
Char-
acter
data
8 bits
×
288
words
Color
data
3 bits
×
288
words
Blink
data
1 bit
×
288
words
Re-
verse
data
1 bit
×
288
words
Out-
put
speci-
fication
data
1 bit
×
288
words
Back-
ground
control
data
register
Display
control
data
register
OSC
IN
Oscil-
lator
Vertical address
register for
display position
OSC
OUT
Character
generator ROM
12
×
18 bits
×
256 words
(
µ
PD6461)
/
×
128 words
(
µ
PD6462)
Hsync
Synchro-
nization
protection
circuit
Vertical size
counter
Vertical position
counter
Vertical address
counter
Output controller
Vsync
µ
PD6461, 6462
V
R
V
G
V
B
V
BLK
V
C1
BLK1 V
C2
BLK2
(B
BLK
)
(B
BLK
)
(R
BLK
)
Remark
Signals in (
) are set by a mask option (RGB + RGB compatible blanking).
3
µ
PD6461, 6462
PIN CONFIGURATION (TOP VIEW)
20-pin plastic shrink SOP (300 mil)
µ
PD6461GS-xxx
µ
PD6462GS-xxx
CLK
CS
DATA
PCL
V
DD
CK
OUT
OSC
OUT
OSC
IN
TEST
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Hsync
Vsync
V
B
V
G
V
R
V
BLK
(B
BLK
)
V
C2
(G
BLK
)
BLK2 (R
BLK
)
V
C1
BLK1
24-pin plastic SOP (375 mil)
µ
PD6461GT-xxx
CLK
CS
N.C.
DATA
PCL
V
DD
CK
OUT
OSC
OUT
OSC
IN
TEST
GND
N.C.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Hsync
Vsync
N.C.
V
B
V
G
V
R
V
BLK
(B
BLK
)
V
C2
(G
BLK
)
BLK2 (R
BLK
)
V
C1
BLK1
N.C.
Remarks 1.
xxx indicates a ROM code suffix.
2.
Signals in ( ) are set by a mask option (RGB + RGB compatible blanking).
4
µ
PD6461, 6462
B
BLK
CK
OUT
CLK
CS
DATA
G
BLK
GND
Hsync
N.C.
OSC
IN
OSC
OUT
PCL
R
BLK
TEST
V
B
V
BLK
V
C1
, V
C2
V
DD
V
G
V
R
Vsync
: Blanking B
: Clock Output
: Clock Input
: Chip Select
: Data Input
: Blanking G
: Ground
: Horizontal Synchronous Signal Input
: No Connection
: Oscillator Input
: Oscillator Output
: Power-on Clear
: Blanking R
: Test
: Character Signal Output
: Blanking Signal Output for V
R
, V
G
, V
B
: Character Signal Output 1, 2
: Power Supply
: Character Signal Output
: Character Signal Output
: Vertical Synchronous Signal Input
BLK1, BLK2: Blanking Output 1, 2
5
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