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  The EM78P809N is an 8-bit microprocessor with low-power, high-speed CMOS technology and high noise immunity. It has a built-in 8K x 13-bits Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides multi-protection bits to prevent intrusion of user's OTP memory codes. Seven Option bits are also available to meet user's requirements.

With its OTP-ROM feature, the EM78P809N is able to offer a convenient way of developing and verifying user's programs. Moreover, user can take advantage of ELAN Writer to easily program his development code


  • Operating voltage: 2.5V ~ 5.5V
  • Operating temperature range: -40°C ~ 85°C
  • Operating frequency range (base on 2 clocks)
    * Crystal mode: 1MHz ~ 8MHz at 4.5V, 1MHz ~ 4MHz at 2.5V
    * RC mode: 1MHz ~ 4MHz at 2.5V
  • Low power consumption:
    * Typically 0.8 μA, during sleep mode
  • 8K x 13 bits on-chip ROM
    Multi-security bits to prevent intrusion of OTP memory codes
  • One configuration register accommodates user's requirements
  • 144 x 8 bits on-chip registers (SRAM, general purpose register)
  • 4 bi-directional I/O ports (22 pins)
    * High sink current output pin: 14 pins
    * 10 programmable pull high I/O pins
    * 10 programmable pull low I/O pins
  • 8 level stacks for subroutine nesting
  • High performance MCU: Two clocks per instruction cycle
  • 15 interrupts (External: 4, Internal: 11)
  • Programmable free running watchdog timer
  • 16 bits Counter/Timer
    * TC2: Timer/Counter/Window
  • 8 bits Timer/Counter
    * TCC: 8-bit real time clock/counter with overflow interrupt
    * TC3: Timer/Counter/Capture
    * TC4: Timer/Counter/ PWM (pulse width modulation)/PDO (Programmable divider output)
  • Time Base Timer: (1Hz ~ 16KHz at 8MHz)
  • Key tone output: (1KHz ~ 8KHz at 8MHz)
  • Serial transmitter/receiver interface
    * Serial Peripheral Interface (SPI): Three-wire synchronous communication
    * Universal asynchronous receiver transmitter interface (UART): Two wire asynchronous communication
  • AD converter
    * 8 channel 10 bits resolution AD converter
  • Operating mode:
    * Normal mode: Oscillation circuit turned on, CPU and Peripheral circuit in operation
    * Idle mode: Oscillation circuit turned on, CPU halt and Peripheral circuit in operation
    * Sleep mode: Oscillation circuit turned off, CPU and Peripheral circuit halt
  • Package types:
    * 28-pin DIP 600mil: EM78P809NP
    * 28-pin SOP 300mil: EM78P809NM
    * 28-pin SSOP 209mil: EM78P809NS
  • 99.9% single instruction cycle commands

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