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MITSUBISHI MICROCOMPUTERS
M37274MA-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
DESCRIPTION
The M37274MA-XXXSP is a single-chip microcomputer designed with
CMOS silicon gate technology. It is housed in a 52-pin shrink plastic
molded DIP.
In addition to their simple instruction sets, the ROM, RAM and I/O
addresses are placed on the same memory map to enable easy pro-
gramming.
The M37274MA-XXXSP has a OSD function and a data slicer func-
tion, so it is useful for a channel selection system for TV with a closed
caption decoder.
•
OSD function
Display characters ............................... 36 characters
!
12 lines
Kinds of characters ...................................................... 256 kinds
(In EXOSD mode, they can be combined with 16 kinds of extra
fonts)
Character display area ........................ CC mode : 16
!
26 dots
OSD mode : 16
!
20 dots
EXOSD mode : 16
!
26 dots
Kinds of character sizes ............................... CC mode : 2 types
OSD mode : 14 types
EXOSD mode : 6 types
It can be specified by a character unit (maximum 7 kinds).
Character font coloring, character background coloring
It can be specified by a screen unit (maximum 7 kinds).
Extra font coloring, raster coloring, border coloring
Kinds of character colors ............... CC mode : 7 kinds (R, G, B)
OSD mode : 7 kinds (R, G, B)
EXOSD mode : 5 kinds (R, G, B)
Display position
Horizontal ................................................................ 256 levels
Vertical .................................................................. 1024 levels
Attribute ...................... CC mode : smooth italic, underline, flash
OSD mode : border
EXOSD mode : border,
extra font (16 kinds)
Automatic solid space function
Window function
Dual layer OSD function
FEATURES
•
Number of basic instructions ..................................................... 71
•
Memory size
ROM ....................................................... 40 K bytes
RAM ..........................................................768 bytes
ROM correction memory ............................. 64 bytes
ROM for OSD ....................................... 11072 bytes
RAM for OSD .......................................... 1296 bytes
Minimum instruction execution time
......................................... 0.5
µ
s (at 8 MHz oscillation frequency)
Power source voltage ................................................... 5 V
±
10 %
Subroutine nesting ............................................. 128 levels (Max.)
Interrupts ....................................................... 18 types, 16 vectors
8-bit timers .................................................................................. 6
Programmable I/O ports (Ports P0, P1, P2, P3
0
, P3
1
) .............. 26
Input ports (Ports P4
0
–P4
6
, P6
3
, P6
4
, P7
0
–P7
2
) ...................... 12
Output ports (Ports P5
2
–P5
5
) ...................................................... 4
12 V withstand ports .................................................................... 7
LED drive ports ........................................................................... 2
Serial I/O ............................................................ 8-bit
!
1 channel
Multi-master I
2
C-BUS interface ................................1 (2 systems)
A-D converter (8-bit resolution) .................................... 4 channels
PWM output circuit ......................................... 14-bit
!
1, 8-bit
!
7
Power dissipation
In high-speed mode .......................................................... 165mW
(at V
CC
= 5.5V, 8MHz oscillation frequency, CRT on, and Data
slicer on)
In low-speed mode ........................................................... 0.33mW
(at V
CC
= 5.5V, 32kHz oscillation frequency)
Data slicer
ROM correction function
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
APPLICATION
TV with a closed caption decoder
•
•
M
ELI
PR
.
.
tion change
ifica
pec bject to
ls
fina re su
a
ot a
is n c limits
is
: Th menti
ice
Not e para
Som
ARY
IN
MITSUBISHI MICROCOMPUTERS
M37274MA-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
FUNCTIONS
Parameter
Number of basic instructions
Instruction execution time
Clock frequency
Memory size
ROM
RAM
ROM correction memory
OSD ROM
OSD RAM
Input/Output ports
P0
0
–P0
2
,
P0
4
–P0
7
P0
3
P1
0
, P1
5
–P1
7
P1
1
–P1
4
P2
P3
0
, P3
1
P4
0
–P4
4
P4
5
, P4
6
P5
2
–P5
5
P6
3
P6
4
P7
0
–P7
2
Serial I/O
Multi-master
I
2
C-BUS
interface
A-D converter
PWM output circuit
Timers
Subroutine nesting
Interrupt
I/O
I/O
I/O
I/O
I/O
I/O
Input
Input
Output
Input
Input
Input
Functions
71
0.5
µ
s (the minimum instruction execution time, at 8 MHz oscillation fre-
quency)
8 MHz (maximum)
40 K bytes
768 bytes
64 bytes
11072 bytes
1296 bytes
7-bit
!
1 (N-channel open-drain output structure, can be used as 8-bit
PWM output pins)
1-bit
!
1
(CMOS input/output structure, can be used as 14-bit PWM output pin)
4-bit
!
1 (CMOS input/output structure, can be used as OSD output pin,
INT input pin, serial input pin)
4-bit
!
1 (N-channel open-drain output structure, can be used as multi-
master I
2
C-BUS interface)
8-bit
!
1 (CMOS input/output structure, can be used as A-D input pins)
2-bit
!
1 (CMOS input/output structure)
5-bit
!
1 (can be used as A-D input pins, INT input pins, external clock
input pins)
2-bit
!
1 (N-channel open-drain output structure when serial I/O is used,
can be used as serial I/O pins)
4-bit
!
1 (CMOS output structure, can be used as OSD output)
1-bit
!
1 (can be used as sub-clock input pin, OSD clock input pin)
1-bit
!
1 (CMOS output structure when LC is oscillating, can be used as
sub-clock output pin, OSD clock output pin)
3-bit
!
1 (can be used as data slicer input/output)
8-bit
!
1
1
6 channels (8-bit resolution)
14-bit
!
1, 8-bit
!
7
8-bit timer
!
6
128 levels (maximum)
External interrupt
!
3, Internal timer interrupt
!
6, Serial I/O interrupt
!
1,
OSD interrupt
!
1, Multi-master I
2
C-BUS interface interrupt
!
1,
Data slicer interrupt
!
1, f(X
IN
)/4092 interrupt
!
1, V
SYNC
interrupt
!
1, A-
D conversion interrupt
!
1, BRK instruction interrupt
!
1
2 built-in circuits (externally connected to a ceramic resonator or a quartz-
crystal oscillator)
Built in
Clock generating circuit
Data slicer
4
M
ELI
PR
.
.
tion change
ifica
pec bject to
ls
fina re su
a
ot a
is n c limits
is
: Th menti
ice
Not e para
Som
ARY
IN
MITSUBISHI MICROCOMPUTERS
M37274MA-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
FUNCTIONS (continued)
Parameter
OSD function
Number of display characters
Character display area
36 characters
!
12 lines
CC mode: 16
!
26 dots (dot structure: 16
!
20 dots)
OSD mode: 16
!
20 dots
EXOSD mode: 16
!
26 dots
Kinds of characters
Kinds of character sizes
256 kinds
(In EXOSDmode, they can be combined with 16 kinds of extra fonts)
CC mode: 2 kinds
OSD mode: 14 kinds
EXOSD mode: 6 kinds
Kinds of character colors
CC mode: 7 kinds (R, G, B)
OSD mode: 7 kinds (R, G, B)
EXOSD mode: 5 kinds (R, G, B)
Display position (horizontal, vertical)
Power source voltage
Power dissipation
256 levels (horizontal)
!
1024 levels (vertical)
5 V
±
10 %
Functions
In high-speed OSD ON Data slicer ON 165 mW typ. (at oscillation frequency f(X
IN
) = 8 MHz, f
OSC
= 13 MHz)
mode
OSD OFF Data slicer OFF 82.5 mW typ. (at oscillation frequency f(X
IN
) = 8 MHz)
In low-speed
mode
In stop mode
OSD OFF Data slicer OFF 0.33mW typ. (at oscillation frequency f(X
CIN
) = 32 kHz, f(X
IN
) = stopped)
0.055 mW (maximum)
–10
°C
to 70
°C
CMOS silicon gate process
52-pin shrink plastic molded DIP
Operating temperature range
Device structure
Package
5
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