GENERAL DESCRIPTION
EM73A83 is an advanced single chip CMOS 4-bit micro-controller. It contains 16K-byte ROM, 500-nibble RAM, 4-bit ALU, 13-level subroutine nesting, 22-stage time base, two 12-bit timer/counters for the kernel function. EM73A83 also equipped with 6 interrupt sources, 3 I/O ports (including 1 input port and 2 bidirection ports), LCD display (40x16), built-in sound generator and speech synthesizer.
Its low power consumption and high speed feature are further strengten with DUAL, SLOW, IDLE and STOP operation mode for optimized power saving.

FEATURES
• Operation voltage : 2.2V to 4.8V.
• Clock source : Dual clock system. Low-frequency oscillator is 32 KHz Crystal oscillator or RC oscillator by mask option and high-frequency oscillator is a built-in internal oscillator (4.6 MHz).
• Instruction set : 107 powerful instructions.
• Instruction cycle time : 1.7µs for 4.6M Hz (high speed clock).
                                       244µs for 32768 Hz (low speed clock).
• ROM capacity : 16K x 8 bits.
• RAM capacity : 500 x 4 bits.
• Input port : 1 port (P0.0-P0.3), IDLE/STOP releasing function is available by mask option. (each input pin has a pull-up and pull-down resistor available by mask option).
• Bidrection port : 2 ports (P4, P8). IDLE/STOP release function for P8(0..3) is available by mask option.
• Built-in watch-dog-timer counter : It is available by mask option.
• 12-bit timer/counter : Two 12-bit timer/counters are programmable for timer, event counter and pulse width measurement mode.
• Built-in time base counter : 22 stages.
• Subroutine nesting : Up to 13 levels.
• Interrupt : External interrupt . . . . . . 2 input interrupt sources.
                   Internal interrupt . . . . . . 2 timer overflow interrupts, 1 time base interrupt.
                                                          1 speech interrupt.
• LCD driver : 40x16 dots, 1/16 duty, 1/5 bias with voltage multiplier.
• Sound effect : Tone generator and random generator.
• Speech synthesizer : 160K speech data ROM (use as 160K nibbles data ROM).
• Power saving function : SLOW, IDLE, STOP operation modes.
• Package type : Chip form 85 pins.