1. DESCRIPTION
The M37212M6-XXXSP/FP, M37212M4/M8-XXXSP are single-chip
microcomputers designed with CMOS silicon gate technology. They
have a OSD, I
2
C-BUS interface, and PWM, so it is useful for a chan-
nel selection system for TV.
The feature of the M37212EFSP/FP are similar to those of the
M37212M6-XXXSP/FP except that these chips have a built-in PROM
which can be written electrically. The differences between the
M37212M6-XXXSP/FP and M37212M4/M8-XXXSP are the ROM size
and the RAM size as shown below. Accordingly, the following de-
scriptions will be for M37212M6-XXXSP/FP unless otherwise noted.
2. FEATURES
G
Number of basic instructions ..................................................... 71
G
Memory size
ROM............... .........16K bytes (M37212M4-XXXSP)
24K bytes (M37212M6-XXXSP/FP)
32K bytes (M37212M8-XXXSP)
62K bytes (M37212EFSP/FP)
RAM .........................320 bytes (M37212M4-XXXSP)
384 bytes (M37212M6-XXXSP/FP)
576 bytes (M37212M8-XXXSP)
1280 bytes (M37212EFSP/FP)
(*ROM correction memory included)
G
The minimum instruction execution time
.........................................0.5
μ
s (at 8 MHz oscillation frequency)
G
Power source voltage .................................................. 5 V
±
10 %
G
Subroutine nesting
maximum 96 levels (M37212M4/M8-XXXSP, M37212M6-XXXSP/FP)
maximum 128 levels (M37212EFSP/FP)
G
Interrupts........................................................ 14 types, 14 vectors
G
8-bit timers ................................................................................... 4
G
Programmable I/O ports
(Ports P0, P1
0
–P1
4
, P2, P3
0
, P3
1,
P4
0,
P4
1
) ............................. 25
G
Input ports (Ports P1
5
–P1
7
, P3
2
–P3
7
, P4
2
) ............................... 10
G
Output ports (Ports P5
2
–P5
5,
P6
0
–P6
3
)....................................... 8
G
12 V withstand ports .................................................................. 12
G
LED drive ports ............................................................................ 4
G
Serial I/O .............................................................8-bit
1 channel
G
Multi-master I
2
C-BUS interface ............................... 1 (2 systems)
G
A-D comparator (6-bit resolution) .................................8 channels
G
PWM output circuit..........................................14-bit
1, 8-bit
8
G
Power dissipation..............................................................165 mW
(at 8 MHz oscillation frequency, V
CC
=5.5V, at OSD display)
G
ROM correction function ................................................. 2 vectors
Note:
Only M37212M8-XXXSP and M37212EFSP/FP have ROM
correction function.
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
M37212EFSP/FP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
G
OSD function
Display characters ................................... 24 characters
2 lines
(It is possible to display 3lines or more by software)
Kinds of characters ........................................................256 kinds
Character display area..............................................12
16 dots
Kinds of character sizes.....................................................3 kinds
Kinds of character colors .................................. 8 colors (R, G, B)
Coloring unit................... character, character background, raster
Display position.............................................................................
Horizontal: 64 levels
Vertical: 128 levels
Attribute ..............................................................................border
3. APPLICATION
TV