DESCRIPTION
The 38B5 group is the 8-bit microcomputer based on the 740 family core technology.
The 38B5 group has six 8-bit timers, a 16-bit timer, a fluorescent display automatic display circuit, 12-channel 10-bit A-D converter, a serial I/O with automatic transfer function, which are available for controlling musical instruments and household appliances. The 38B5 group has 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 .......................... 0.48 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.