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  - QFP-44L
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  General Description

The EM785830AD is an 8-bit RISC type microprocessor with low power, high speed CMOS technology. There are 16K x 13 bits Memory within it. This integrated single chip has an on_chip watchdog timer (WDT), program ROM, data RAM, LCD driver, programmable real time clock/counter, internal interrupt, power down mode, built-in three-wire SPI, dual PWM(Pulse Width Modulation), 6-channel 10-bit A/D converter and tri-state I/O.



  • Operating voltage : 2.2V~5.5V at main CLK less then 3.58MHz. 
  • Main CLK(Hz) Under 3.58M 7.16M 10.74M 14.3M



    2.2  2.5 3 3.6
  • 16k x 13 on chip Program Memory.
  • 0.5k x 8 on chip data RAM
  • Up to 31 bi-directional tri-state I/O ports
  • 12 level stack for subroutine nesting
  • 8-bit real time clock/counter (TCC)
  • two 8-bit counters : COUNTER1 and COUNTER2
  • On-chip watchdog timer (WDT)
  • 99.9% single instruction cycle commands
  • Three operating modes (Main clock can be programmed from 447.829K to 14.3MHz generated by internal PLL)
  • Mode CPU status Main clock 32.768KHz clock status
    Sleep mode Turn off Turn off Turn off
    Green mode Turn on Turn off Turn on
    Normal mode Turn on Turn on Turn on
  • Input port interrupt function
  • 12 interrupt source, 4 external, 8 internal
  • Dual clocks operation (Internal PLL main clock , External 32.768KHz)


  • Serial Peripheral Interface (SPI) : a kind of serial I/O interface
  • Interrupt flag available for the read buffer full or transmitter buffer empty.
  • Programmable baud rates of communication
  • Three-wire synchronous communication. (shared with IO)


  • Dual PWM (Pulse Width Modulation) with 10-bit resolution
  • Programmable period (or baud rate) 
  • Programmable duty cycle


  • Operating : 2.5V∼5.5V
  • 6-channel 10-bit successive approximation A/D converter
  • Internal (VDD) or external reference


  • Power-on voltage detector reset


  • Common driver pins : 4
  • Segment driver pins : 13
  • 1/3 bias
  • 1/4 duty, 1/2 duty
  • 16 Level LCD contrast control by software


  • EM785830ADQ, EM78P5830DQ, EM78P5830ADQ→ 44 pin QFP


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