Description
The HD404374, HD404384, and HD404389 Series comprise low-voltage, 4-bit single-chip microcomputers equipped with four 10-bit A/D converter channels, a serial interface, and large-current I/O pins. These devices are suitable for use in applications requiring high resolution A/D converter control, such as battery chargers.
The HD404082 and HD404084 series offer less advanced features than the HD404384 series. They are 4-bit microcomputers that support low-voltage operation for backward software compatibility.
HD404374 Series microcomputers have a 32.768 kHz sub-resonator for realtime clock use, providing a time counting facility, and a variety of low-power modes to reduce current drain.

Features
• 20 I/O pins
    Large-current I/O pins (source: 10 mA max.):4
    Large-current I/O pins (sink: 15 mA max.):4
    Analog input multiplexed pins: 4 (HD404374, HD404384, and HD404389 Series)
• 8-bit timer: 1 channel
    16-bit timer: 1 channel (Can also be used as two 8-bit timer channels)
• Two timer outputs (including PWM output)
• Event counter inputs (edge-programmable)
• Clock-synchronous 8-bit serial interface
• A/D converter
    4 channels × 10-bits (HD404374 and HD404384 Series)
    6 channels × 10-bits (HD404389 Series)
    None (HD404082 and HD404084 Series)
Note: * CR oscillation in an optional function.
• Interrupts
    External: 2 (including one edge-programmable)
    Internal : 5 (HD404374/HD404384/HD404389 Series)
    : 4 (HD404082/HD404084 Series)
• Subroutine stack up to 16 levels, including interrupts
• Low-power dissipation modes
     HD404374 Series: 4
     HD404384, HD404389, HD404082, and HD404084 Series: 2
• Module standby (timers, serial interface, A/D converter)
• System clock division software switching (1/4 or 1/32)
• Inputs for return from stop mode (wakeup): 1
• Instruction execution time
    Min. 0.89 µs (fOSC = 4.5 MHz, division by 1/4)
    Min. 0.47 µs (fOSC = 8.5 MHz, division by 1/4)
• Operation voltage
    1.8 V to 5.5 V
    2.0 V to 5.5 V (ZTATTM)