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