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