EM78F648N is an 8-bit microprocessor designed and developed with low-power, high-speed CMOS technology. It is
equipped with 8K*15-bits Electrical Flash Memory, 256*8 bits in system programmable EEPROM, two comparators, three
8 bits timers, one 16 bits timer, two 10 bits PWM, SPI, UART and I2C.
With its Flash-ROM feature, the EN78F648N is able to offer a convenient way of developing and verifying users'
programs. Moreover, users can take advantage of EMC Writer to easily program his development code.

• CPU configuration

• Support 8K×15 bits program ROM
• 304×8 bits on chip registers (SRAM)
• 256 bytes in-system programmable EEPROM
  *Endurance: 1,000,000 write/erase cycles
• More than 10 years data retention
• 8 level stacks for subroutine nesting
• Less than 2 mA at 5V/4MHz
• Typically 20 μA, at 3V/32kHz
• Typically 2 μA, during sleep mode
• Four operation mode

Mode	CPU	Main clock	WDT clock
Sleep mode	Turn off	Turn off	Turn off
Idle Mode	Turn off	Turn off	Turn on
Green mode	Turn on	Turn off	Turn on
Normal mode	Turn on	Turn on	Turn on

• I/O port configuration

• 5 bidirectional I/O ports: P5, P6, P7, P8, P9
• Pin change wake-up port : P6
• 40 programmable pull-down I/O pins
• 40 programmable pull-high I/O pins
• 40 programmable open-drain I/O pins
• 40 programmable high-sink/drive I/O pins
• External interrupt : P60

• Operating voltage range:

• 2.4V~5.5V at 0°C~70°C (commercial)
• 2.6V~5.5V at -40°C~85°C (industrial)

• Operating frequency range (base on 2 clocks):

• Crystal mode:

DC ~ 20MHz at 5V
DC ~ 8MHz at 3V
DC ~ 4MHz at 2.4V

• ERC mode:

DC ~ 20MHz at 5V
DC ~ 8MHz at 3V
DC ~ 4MHz at 2.4V

• IRC mode

DC ~ 16MHz at 4.5V~5.5V
DC ~ 4MHz at 2.4V~5.5V

• Internal RC Drift Rate (Ta=25°C, VDD=5V±5%,VSS=0V)

• Peripheral configuration

• 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
• Two Pulse Width Modulation (PWMA,B) with 10-bitresolution which shared with Timer A,B
• Two 8 bits Timer/Counter:
• C1: Timer/Counter/Capture mode selection
• TC3: Timer/Counter/PWM/PDO(programmable divider output)
• Mode selection
• One 16 bits Timer/Counter:
• TC2: Timer/Counter/Window mode selection
• 4 programmable Level Voltage Detector (LVD): Vdd power monitor and support low voltage detector interrupt flag
• One pair of comparator
• Serial transmitter/receiver interface (SPI): three wire synchronous communication
• Universal asynchronous receiver transmitter interface (UART): two wire asynchronous communication
• Power-down (Sleep) mode
• High EFT immunity(4MHZ,4clocks)
• I2C function with 7/10 bits address & 8 bits data transmit/receive mode

• 18 available interrupts (5 external, 13 internal )

• External interrupt(P60)
• TCC overflow interrupt
• TC1,TC2, TC3 overflow interrupt
• Input-port status changed interrupt (wake up from sleep mode)
• PWMA, PWMB period match completion
• Comparator 1/2 high/low interrupt
• I2C transfer/receive/stop interrupt
• UART TX, RX , RX error interrupt
• SPI interrupt
• LVD interrupt

• Programmable free running Watchdog Timer

• Watchdog Timer: 16.5ms ± 5% with Vdd =5V at 25°C, Temperature range ± 5% (-40°C ~+85°C)
• Watchdog Timer: 18ms ± 5% with Vdd = 3V at 25°C
• Temperature range ± 5% (-40°C~+85°C) Two clocks per instruction cycle

• Package Type:

• 44 pin QFP: EM78F648NQ44J/S
• 40 pin DIP: EM78F648ND40J/S
• 28 pin SKDIP: EM78F648NK28J/S
• 28 pin SOP: EM78F648NSO28J/S

Note: Green products do not contain hazardous substances.

• 99.9% single instruction cycle commands
• There are 4 kinds of oscillation ranges in crystal mode

Crystal ranges	Oscillator Mode
20MHz~6MHz	HXT
6MHz~1MHz	XT
1MHz~100KHz	LXT1
32.768KHz	LXT2