DESCRIPTION
The M37225M6/M8/MA/MC–XXXSP are single-chip microcomputers designed with CMOS silicon gate technology. They have a OSD, I2C-BUS interface, PWM output, and 12 V withstand, so it is useful for a channel selection system for TV.
The features of the M37225ECSP are similar to those of the M37225M6-XXXSP except that the chip has a built-in PROM which can be written electrically. The differences amang M37225M6/M8/MA/MC–XXXSP are the ROM, RAM size. Accordingly, the following descriptions will be for the M37225M6-XXXSP

FEATURES
● Number of basic instructions .................................................... 71
● Memory size
   ROM ......... 24K bytes (M37225M6-XXXSP)
      32K bytes (M37225M8-XXXSP)
      40K bytes (M37225MA–XXXSP)
      48K bytes (M37225MC–XXXSP, M37225ECSP)
   RAM ......... 1024 bytes (M37225M6/M8-XXXSP)
      2048 bytes (M37225MA/MC–XXXSP, M37225ECSP)
      (✽ ROM correction memory included)
● Minimum instruction execution time
   ......................................... 0.5 µs (at 8 MHz oscillation frequency)
● Power source voltage ................................................. 5 V ± 10 %
● Subroutine nesting ............................................. 128 levels (Max.)
● Interrupts ....................................................... 16 types, 16 vectors
● 8-bit timers .................................................................................. 4
● Programmable I/O ports (Ports P0, P1, P2, P30–P32, P35) ..... 28
● Input ports (Ports P33, P34, P50, P51) ........................................ 4
● Output ports (Ports P52–P55) ..................................................... 4
● 12 V withstand ports ................................................................... 6
● LED drive ports ........................................................................... 4
● Serial I/O ............................................................ 8-bit ✕ 1 channel
● Multi-master I2C-BUS interface .............................. 1 (2 systems)
● A-D converter (8-bit resolution) .................................... 8 channels
● PWM output circuit ........................................ 14-bit ✕ 2, 8-bit ✕ 6
● Power dissipation
   In operating ...................................................................... 165 mW
   (at VCC = 5.5V, 8 MHz oscillation frequency, and OSD on)
● ROM correction function ................................................ 3 vectors
● Immediate return mode from wait state
● OSD function
   Display characters ............................................... 24 characters ✕ 2 lines
      (It is possible to display 3 lines or more by software)
   Kinds of characters ......... 381 kinds
   Character display area 16 ✕ 20 dots
   Kinds of character sizes .............................. Block display: 3 kinds
      SPRITE display: 1 kinds
   Kinds of character colors. ................................. 8 colors (R, G, B)
   Coloring unit ................... character, character background, raster
   Display position
      Horizontal: 64 levels Vertical :255 levels
   Attribute ........ Border (all-bordered, shadow-bordered), BUTTON
   SPRITE display function
   Wallpaper function
   Window function
   Corresponding to bi-scan mode

APPLICATION
   TV