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DESCRIPTION

The M37224M3-XXXSP is a single-chip microcomputer designed with CMOS silicon gate technology. They are housed in a 42-pin shrink plastic molded DIP.

In addition to their simple instruction sets, the ROM, RAM and I/O addresses are placed on the same memory map to enable easy programming.

The M37224M3-XXXSP has a PWM output function and a OSD display function, so it is useful for a channel selection system for TV.

FEATURES

? Number of basic instructions ..................................................... 71

? Memory size

ROM ....................................................... 12 K bytes

RAM ..........................................................256 bytes

ROM for display ........................................ 8 K bytes

RAM for display .......................................... 96 bytes

? Minimum instruction execution time

......................................... 0.5 μs (at 8 MHz oscillation frequency)

? Power source voltage................................................... 5 V ± 10

? Power dissipation ............................................................. 165 mW

(at 8 MHz oscillation frequency, VCC=5.5V, at CRT display)

? Subroutine nesting ....................................... 96 levels (maximum)

? Interrupts ....................................................... 13 types, 13 vectors

? 8-bit timers .................................................................................. 4

? Programmable I/O ports (Ports P0, P1, P2, P30–P32) .............. 27

? Input ports (Ports P33, P34) ........................................................ 2

? Output ports (Ports P52–P55)...................................................... 4

? 12 V withstand ports.................................................................... 6

? LED drive ports ........................................................................... 4

? Serial I/O ............................................................ 8-bit ? 1 channel

? A-D comparator (6-bit resolution) ................................. 6 channels

? D-A converter (6-bit resolution) ................................................... 2

? PWM output circuit ......................................... 14-bit ? 1, 8-bit ? 6

? ROM correction function ........................................... 32 bytes ? 2

? CRT display function

Number of display characters................ 20 characters ? 2 lines

(16 lines maximum)

Kinds of characters ..................................................... 128 kinds

Dot structure ........................................................... 12 ? 16 dots

Kinds of character sizes .................................................. 3 kinds

Kinds of character colors (It can be specified by the character)

maximum 7 kinds (R, G, B)

Kinds of raster colors (maximum 7 kinds)

Display position

Horizontal .................................................................. 64 levels

Vertical .................................................................... 128 levels

Bordering (horizontal and vertical)

APPLICATION

TV