Description
The HD404829R series incorporates an 8-bit A/D converter (four channels), a Liquid Crystal Display (LCD) and a serial interface, and has large-current Input/Output (I/O) pins. The series is a 4-bit single-chip microcomputer best used in the AV equipment such as CD radio cassette tape recorders which require the LCD display control.

Features
• 1,876-digit × 4-bit RAM
• 44 I/O pins, including 10 high-current pins (15 mA, max.) and 20 pins multiplexed with LCD segment pins
• Four timer/counters
• 8-bit input capture circuit
• Three timer outputs (including two PWM out-puts)
• Two event counter inputs (including one double-edge function)
• Clock-synchronous 8-bit serial interface
• A/D converter (4 channels × 8 bits)
• LCD controller/driver (52 segments × 4 commons)
• Built-in oscillators
    ― Main clock: 4.2-MHz ceramic (an external clock is also possible)
    ― Subclock: 32.768-kHz crystal
• Eleven interrupt sources
    ― Five by external sources, including three double-edge functions
    ― Six by internal sources
• Subroutine stack up to 16 levels, including interrupts
• Four low-power dissipation modes
    ― Subactive mode
    ― Standby mode
    ― Watch mode
    ― Stop mode
• One external input for transition from stop mode to active mode
• Instruction cycle time (min.): 0.95 µs (fOSC = 4.2 MHz)
• Operation voltage
    VCC = 2.7 V to 6.0 V (HD404829R)
    VCC = 2.7 V to 5.5 V (HD4074829)
• Two operating modes
    ― MCU mode
    ― MCU/PROM mode (HD4074829 only)