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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.
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
M37274MA-XXXSP
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
APPLICATION
TV with a closed caption decoder
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