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  The EM78P5840N series are 8-bit RISC architecture microcontroller devices designed and developed with low-power, high-speed CMOS technology. Each of these devices has on-chip 4K´13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a protection bit to prevent intrusion of user’s OTP memory code as well as from unwanted external accesses. A number of one-time programmable option bits are also available to meet user’s application requirements.
Functional flexibility of these integrated Ics is enhanced with their internal special features such as watchdog timer (WDT), program OTP-ROM, RAM, programmable real-time clock/counter, internal interrupt, power down mode, dual PWM (Pulse Width Modulation), 8-channel 10-bit A/D converter, and tri-state I/O.

  • CPU configuration
  • 4Kx13 bits on-chip ROM
  • 144x8 bits on-chip registers (SRAM)
  • 8-level stacks for subroutine nesting
  • Less than 2.5 mA at 5V/3.58 MHz
  • Typically 25 uA, at 3V/32kHz (Green)
  • Typically 1 uA, during sleep mode
  • I/O port configuration
  • 4 bidirectional I/O ports
  • 5 programmable pull-high I/O pins
  • External interrupt : P70, P71, P73
  • Operating voltage range: 
  • 2.2V~5.5V at 0°C~70°C (commercial)
  • 2.4V~5.5V at -40°C~85°C (industrial) 
  • Operating frequency range (base on 2 clocks)
  • Crystal mode: DC ~ 14.3MHz, 3.6V; DC ~ 3.58MHz, 2.2V
  • RC mode: DC ~ 14MHz, 3.6V; DC ~ 2MHz, 2.2V
  • Internal RC Drift Rate (Ta=25°C, VDD=5V±5%, VSS=0V) 

Internal RC Frequency Drift Rate
Temperature(-40°C~85°C) Voltage(2.2V~5.5V) Process Total
2 MHz ±5% ±5% ±4% ±14%
4 MHz ±5% ±5% ±4% ±14%

  • The two main frequencies can be auto trimmed by ELAN Writer
  • Three operation modes using crystal oscillator (Main clock can be programmed to 3.58 MHz or 14.3 MHz) :
  • Two Normal mode frequency levels: 3.58 MHz and 14.3 MHz.
  • Input port interrupt function
  • Dual-clock operation (Internal PLL main clock, 

Mode CPU Status Main Clock 32.768kHz Clock Status
Sleep Off Off Off
Green On Off On
Normal On On On

  • Peripheral configuration
  • 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt.·
  • 8-bit multi-channel Analog-to-Digital Converter with 10-bit resolution

Operating Voltage (V) (min) 3.5 3.0 2.5 2.5
Converter Rate (kHz, max) 74.5 37.4 18.7 9.3

  • Pulse Width Modulation (PWM): Three PWM with 10-bit resolution 
  • One 8-bit counter interrupt
  • On-chip watchdog timer WDT)
  • Power-down (Sleep, Green) mode
  • Five available interrupts
  • TCC overflow interrupt
  • One 8-bit counter interrupt
  • External interrupt
  • ADC completion interrupt
  • PWM period match completion 
  • Package Types
  • 18-pin DIP 300mil : EM78P5840ND18J/S 
  • 18-pin SOP 300mil : EM78P5840NSO18J/S
  • 20-pin DIP 300mil : EM78P5840ND20J/S
  • 20-pin SOP 300mil : EM78P5840NSO20J/S
  • 24 pin DIP 600mil : EM78P5840ND24J/S
  • 24-pin skinny DIP 300mil : EM78P5840NK24J/S
  • 24 pin SOP 300mil : EM78P5840NSO24J/S

Note: Green products do not contain hazardous substances.

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