DESCRIPTION

The 38C2 group is the 8-bit microcomputer based on the 740 family core technology.

The 38C2 group has an LCD drive control circuit, a 10-channel A-D converter, and a Serial I/O as additional functions.

The various microcomputers in the 38C2 group include variations of internal memory size and packaging. For details, refer to the section on part numbering.

FEATURES

● Basic machine-language instructions ....................................... 71

● The minimum instruction execution time .......................... 0.25 μs

(at 8MHz oscillation frequency)

● Memory size

ROM ................................................................ 16 K to 60 K bytes

RAM ................................................................. 640 to 2048 bytes

● Programmable input/output ports ............................................. 51

(common to SEG: 24)

● Interrupts ................................................... 18 sources, 16 vectors

● Timers ............................................................8-bit ? 4, 16-bit ? 2

● A-D converter ................................................. 10-bit ? 8 channels

● Serial I/O ........................ 8-bit ? 2 (UART or Clock-synchronized)

● PWM .................. 10-bit ? 2, 16-bit ? 1 (common to IGBT output)

● LCD drive control circuit

Bias ................................................................................... 1/2, 1/3

Duty ........................................................................... 1/2, 1/3, 1/4

Common output .......................................................................... 4

Segment output ........................................................................ 24

● Two clock generating circuits

(connect to external ceramic resonator or quartz-crystal oscillator)

● Watchdog timer ............................................................... 8-bit ? 1

● LED direct drive port .................................................................. 8

(average current: 15 mA, peak current: 30 mA, total current: 90 mA)

● Power source voltage

In through mode .......................................................... 4.0 to 5.5 V

(at 8 MHz oscillation frequency)

In frequency/2 mode ................................................... 1.8 to 5.5 V

(at 4 MHz oscillation frequency, A-D operation excluded)

In low-speed mode ..................................................... 1.8 to 5.5 V

(at 32 kHz oscillation frequency)

● Power dissipation

In through mode ................................................................. 26 mW

(at 8 MHz oscillation frequency, VCC = 5 V)

In low-speed mode .............................................................21 μW

(at 32 kHz oscillation frequency, VCC = 3 V)

● Operating temperature range ................................... – 20 to 85°C