DESCRIPTION
The M37212M6-XXXSP/FP, M37212M4/M8-XXXSP are single-chip microcomputers designed with CMOS silicon gate technology. They have a OSD, I2C-BUS interface, and PWM, so it is useful for a channel 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 descriptions will be for M37212M6-XXXSP/FP unless otherwise noted.

FEATURES
● Number of basic instructions ..................................................... 71
● 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)
● The minimum instruction execution time
   ......................................... 0.5 µs (at 8 MHz oscillation frequency)
● Power source voltage .................................................. 5 V ± 10 %
● Subroutine nesting
   maximum 96 levels (M37212M4/M8-XXXSP, M37212M6-XXXSP/FP)
   maximum 128 levels (M37212EFSP/FP)
● Interrupts ........................................................ 14 types, 14 vectors
● 8-bit timers ................................................................................... 4
● Programmable I/O ports
   (Ports P0, P10–P14, P2, P30, P31, P40, P41) ............................. 25
● Input ports (Ports P15–P17, P32–P37, P42) ............................... 10
● Output ports (Ports P52–P55, P60–P63)....................................... 8
● 12 V withstand ports .................................................................. 12
● LED drive ports ............................................................................ 4
● Serial I/O ............................................................. 8-bit ✕ 1 channel
● Multi-master I2C-BUS interface ............................... 1 (2 systems)
● A-D comparator (6-bit resolution) ................................. 8 channels
● PWM output circuit ..........................................14-bit ✕ 1, 8-bit ✕ 8
● Power dissipation .............................................................. 165 mW
   (at 8 MHz oscillation frequency, VCC=5.5V, at OSD display)
● ROM correction function ................................................. 2 vectors
   Note: Only M37212M8-XXXSP and M37212EFSP/FP have ROM
      correction function.

● 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
  
APPLICATION
   TV