DESCRIPTION
The 38B5 group is the 8-bit microcomputer based on the 740 family core technology.

FEATURES
• Basic machine-language instructions ....................................... 71
• The minimum instruction execution time .......................... 0.48 µs (at 4.19 MHz oscillation frequency)
• Memory size
    ROM ............................................. 24K to 60K bytes
    RAM ............................................ 512 to 2048 bytes
• Programmable input/output ports ............................................. 55
• High-breakdown-voltage output ports ....................................... 36
• Software pull-up resistors ...... (Ports P5, P61 to P65, P7, P84 to P87, P9)
• Interrupts .................................................. 21 sources, 16 vectors
• Timers ........................................................... 8-bit ✕ 6, 16-bit ✕ 1
• Serial I/O1 (Clock-synchronized) .................................... 8-bit ✕ 1 ...................... (max. 256-byte automatic transfer function)
• Serial I/O2 (UART or Clock-synchronized) ..................... 8-bit ✕ 1
• PWM .............................................................................14-bit ✕ 1 8-bit ✕ 1 (also functions as timer 6)
• A-D converter .............................................. 10-bit ✕ 12 channels
• Fluorescent display function ........................ Total 40 control pins
• Interrupt interval determination function ..................................... 1
• Watchdog timer ............................................................. 20-bit ✕ 1
• Buzzer output ............................................................................. 1
• 2 Clock generating circuit
    Main clock (XIN–XOUT) ......................... Internal feedback resistor
    Sub-clock (XCIN–XCOUT) ......... Without internal feedback resistor (connect to external ceramic resonator or quartz-crystal oscillator)
• Power source voltage
    In high-speed mode ................................................... 4.0 to 5.5 V (at 4.19 MHz oscillation frequency and high-speed selected)
    In middle-speed mode ............................................... 2.7 to 5.5 V (at 4.19 MHz oscillation frequency and middle-speed selected)
    In low-speed mode .................................................... 2.7 to 5.5 V (at 32 kHz oscillation frequency and low-speed selected)
• Power dissipation
    In high-speed mode .......................................................... 35 mW (at 4.19 MHz oscillation frequency)
    In low-speed mode ............................................................ 60 µW (at 32 kHz oscillation frequency, at 3 V power source voltage)
• Operating temperature range ................................... –20 to 85 °C

APPLICATION
    Musical instruments, VCR, household appliances, etc.