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
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