DESCRIPTION
The µPD178023, 178024 are 8-bit single-chip CMOS microcontrollers containing hardware for digital tuning systems.
These microcontrollers employ a 78K/0 series architecture CPU and allow easy access to internal memories at high speed and easy control of peripheral hardware units. The high-speed 78K/0 series instructions are ideal for system control.
As peripheral hardware, a prescaler, PLL frequency synthesizer, and frequency counter for digital tuning systems are provided, as well as many I/O ports, timers, A/D converter, serial interface, and a power-ON clear circuit. In addition, three serial interfaces, I2C bus (IIC0), three-wire (SIO3), and UART are provided.
Moreover, a flash memory model, the µPD178F124, that operates in the same supply voltage range as the mask ROM models, and various development tools are also under development.

FEATURES
• High-capacity ROM and RAM
• Instruction cycle:
    0.45/0.89/1.78/3.56/7.11 µs (with crystal resonator of
    fX = 4.5 MHz)
• Many internal hardware units
    General-purpose I/O ports, A/D converter, serial
    interface (I2C bus and UART mode), timers, frequency
    counter, power-ON clear circuit
• Hardware for PLL frequency synthesizer
    Dual modulus prescaler, programmable divider,
    phase comparator, charge pump
• Vectored interrupt sources: 17
• Supply voltage
    :VDD = 4.5 to 5.5 V (during PLL and CPU operations)
    :VDD = 3.5 to 5.5 V (during CPU operation)