GENERAL DESCRIPTION
EM73880 is an advanced single chip CMOS 4-bit micro-controller. It contains 8K-byte ROM, 244-nibble RAM, 4-bit ALU, 13-level subroutine nesting, 22-stage time base, two 12-bit timer/counters for the kernel function. EM73880 also contains 6 interrupt sources, 1 input port, 2 bidirection ports, LCD display (32x4), and one high speed timer/counter,sound generator, and speech synthesizer.
EM73880 has plentiful operating modes (SLOW, IDLE, STOP) intended to reduce the power consumption.

FEATURES
• Operation voltage : 2.4V to 3.6V.
• Clock source : Dual clock system. Low-frequency oscillator (32.768 KHz) could be Crystal or RC
   oscillator high-frequency oscillator is a built-in for 4.6 MHz.
• Instruction set : 107 powerful instructions.
• Instruction cycle time : 1.7us for 4.6 MHz (high speed clock).
   244 µs for 32768 Hz (low speed clock).
• ROM capacity : 8192 X 8 bits.
• RAM capacity : 244 X 4 bits.
• Input port : 1 port (P0). P0(0..3) and IDLE releasing function are available by mask option.
• Bidirection port : 2 ports (P4, P8). P4.1 is shared with HTC external input. P8(0..3) and IDLE releasing
   function are available by mask option.
• 12-bit timer/counter : Two 12-bit timer/counters are programmable for timer, event counter and pulse width
   measurement.
• High speed timer/counter : One 8-bit high speed timer/counters is programmable for auto load timer, melody
   output and pulse width measurement.
• Speech synthesizer : 160K Speech ROM.
• Built-in time base counter : 22 stages.
• Subroutine nesting : Up to 13 levels.
• Interrupt : External . . . . . 1 input interrupt sources.
                   Internal . . . . . . 2 Timer overflow interrupts, 1 time base interrupt.
                                            1 high speed timer/counter overflow interrupt.
                                            1 Speech ending interrupt.
• LCD driver : 32 X 4 dots, 1/4,1/3,1/2, static 4 kinds of duty Type selectable, 1/2 bias, 1/3 bias, 2 kinds
   bias Type selectable.
• Power saving function : SLOW, IDLE, STOP operation mode.
• Package type : Chip form. . . . .63 pins.

APPLICATIONS
   EM73880 is suitable for application in family applicance, consumer products, hand held games and the toy controller.