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