• 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

• 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 ~ 8MHz at 3V

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 interrup
• Two Pulse Width Modulation (PWMA,B) with 10-bit resolution which shared with Timer A,B
• Two 8 bits Timer/Counter: TC1: Timer/Counter/Capture mode selection

TC3: Timer/Counter/PWM/PDO(programmabledivider 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
• 8 channels Analog-to-Digital Converter with 12-bitresolution in Vref mode
• One pair of comparator
• Serial transmitter/receiver interface (SPI): three wiresynchronous communication
• Universal asynchronous receiver transmitterinterface (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(4 external, 14 internal )

• External interrupt(P60)
• TCC overflow interrupt
• TC1,TC2, TC3 overflow interrupt
• Input-port status changed interrupt (wake up from sleep mode)
• ADC completion interrupt
• PWMA, PWMB period match completion
• Comparator 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 at25°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: EM78F668NQ44J/S
• 40 pin DIP: EM78F668ND40J/S
• 28 pin SKDIP: EM78F668NK28J/S
• 28 pin SOP: EM78F668NSO28J/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