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This LSI is an 8-bit RISC type microprocessor with high speed CMOS technology and low power consumption. Integrated onto a single chip are on chip watchdog timer (WDT), Data RAM, ROM, programmable real time clock counter, internal/external interrupt, power down mode, LCD driver, infrared transmitter function, and tri-state I/O. The EM78P468L provides multi-protection bits to protect against intrusion of user’s code in the OTP memory and a seven option bits to accommodate user’s requirements. It also provides an especial 13 bits customer ID option.
With its OTP-ROM feature, this LSI offers a convenient way of developing and verifying user’s programs. Moreover, user developed code can be easily programmed with the ELAN writer.


  • Operating voltage and temperature range:
    * EM78P468N:
       * Commercial:2.3V ~ 5.5 V. (at 0℃~+70℃)
       * Industrial: 2.5V ~ 5.5 V. (at -40℃~+85℃)
    * EM78P468L:
       * Commercial:2.1 V ~ 5.5 V. (at ℃~+70℃)
       * Industrial: 2.3V ~ 5.5 V. (at -40℃~+85℃)
  • Operation speed: DC ~ 10MHz clock input
  • Dual clock operation
    * High frequency oscillator can select among Crystal, RC, or PLL (phase lock loop)
    * Low frequency oscillator can select between Crystal or RC mode
  • Totally 272 bytes SRAM
    * 144 bytes general purpose register
    * 128 bytes on chip data RAM
  • 4K x 13 bits OTP - ROM (One Time Programmable - Read Only Memory)
  • Up to 28 bi-directional tri-state I/O ports
    * Typically, 12 bi-directional tri-state I/O ports
    * 16 bi-directional tri-state I/O ports shared with LCD segment output pin
  • 8-level stack for subroutine nesting
  • 8-bit real time clock/counter (TCC)
  • One infrared transmitter/PWM generator function
  • Four sets of 8 bits auto reload down-count timer can be used as interrupt sources
    * Counter 1: independent down-count timer
    * Counter 2, High Pulse Width Timer (HPWT), and Low Pulse Width Timer (LPWT) shared with IR function
  • Programmable free running on chip watchdog timer (WDT). This function can operate on Normal, Green and Idle mode
  • Operation modes:
    * Normal mode: The CPU operated on frequency of main oscillator (Fm)
    * Green mode: The CPU operated on frequency sub-oscillator (Fs) and main oscillator (Fm) stop
    * Idle mode: CPU idle, LCD display remains working
    * Sleep mode: whole chip stop working
  • Input port wake up function (PORT6, PORT8). Working on Idle and Sleep mode
  • Eight interrupt sources, three external and five internal
    * Internal interrupt source : TCC; Counter 1,2; High/Low pulse width timer.
    * External interrupt source : INT0, INT1 and Pin change wake-up (Port 6 and Port 8)
  • Packages:
    * Dice form : 59 pin
    * QFP-64 pin : EM78P468NQ (Body 14mm*20mm)
    * QFP-64 pin : EM78P468LQ (Body 14mm*20mm)
    * LQFP-64 pin : EM78P468NAQ (Body 7mm*7mm)
    * LQFP-64 pin : EM78P468LAQ (Body 7mm*7mm)
    * LQFP-44 pin : EM78P468NBQ (Body 10mm*10mm)
    * LQFP-44 pin : EM78P468LBQ (Body 10mm*10mm)
    * QFP-44 pin : EM78P468NCQ (Body 10mm*10mm)
    * QFP-44 pin : EM78P468LCQ (Body 10mm*10mm)
  • Power on voltage detector provided (2.0 ± 0.1V) for EM78P468N
  • Power on voltage detector provided (1.7 ± 0.1V) for EM78P468L

LCD Circuit

  • Common driver pins: 4
  • Segment driver pins: 32
  • LCD Bias: 1/3, 1/2 bias
  • LCD Duty: 1/4, 1/3, 1/2 duty


  • Remote control for air conditioner
  • Health care
  • Home appliances

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