The EM78P164N is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology. It has an on-chip 1K x 13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides three protection bits to prevent intrusion of user's OTP memory code as well as from unwanted external accesses. Several code option bits are available to meet user's requirements.
With its enhanced OTP-ROM feature, the EM78P164N provides a convenient way of developing and verifying user's programs. Moreover, this OTP device offers the advantages of easy and effective program updates, using development and programming tools. User can avail of the ELAN Writer to easily program his development code.

• CPU Configuration

• 1Kx13 bits on-chip ROM
• 48x8 bits on-chip registers (SRAM, general purpose)
• 5 level stacks for subroutine nesting
• Less than 1.5 mA at 5V/IRC 4 MHz
• Typically 15 uA, at 3V/32kHz
• Typically 1 uA, during Sleep mode
• 3 programmable Level Voltage Reset (LVR):4.0V, 3.3V 2.4V
• Power-on Reset (POR): 1.8V

• I/O Port Configuration

• 2 bidirectional I/O ports : P5, P6
• Wake-up port : P6
• 7 programmable pull-down I/O pins
• 7 programmable pull-high I/O pins
• 7 programmable open-drain I/O pins
• External interrupt : P60
• P51~P54 always open drain which can connect external high voltage about 12V

• Operating Voltage Range:

Operating voltage: 2.0V~5.5V at 0°C ~70°C (commercial)

Operating voltage: 2.2V~5.5V at -40°C ~85°C (industrial)

• Operating Frequency range (base on 2 clocks):

• Crystal Mode:

DC~20MHz/2clks @ 5V

DC~8MHz/2clks @ 3V

DC~4MHz/2clks @ 2.1V

• ERC Mode:

DC~16 MHz/2clks @ 4.5V

DC~12 MHz/2clks @ 4V

DC~4MHz/2clks @ 2.1V

• Internal RC Drift Rate: 

Internal RC Frequency	Drift Rate
	Temperature (-40°C~85°C)	Voltage(2.0V~5.5V)	Process	Total
455kHz	±5%	±5%	±3%	±13%
4 MHz	±5%	±5%	±3%	±13%
8 MHz	±5%	±5%	±3%	±13%
16 MHz	±6%	±5%	±3%	±14%

• Peripheral Configuration

• 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
• One comparator (typical offset voltage 10mV when input voltage range 0.5V~4.5V) with Cin+/internal Vref level select and Cin- 4 channel switch.
• One Pulse Width Modulation (PWM ) with 10-bit resolution
• High EFT immunity
• Power down mode (Sleep mode)

• Five available Interrupts:

• TCC overflow interrupt
• Input-port status changed interrupt (wake-up from sleep mode)
• External interrupt 
• PWM period match completion
• Comparator output change interrupt

• Other Features

• Programmable prescaler of oscillator set-up time
• One security register to prevent intrusion of user's OTP memory code
• One configuration register to match user's requirements
• Two clocks per instruction cycle
• TBRD instruction

• Package Type:

• 14-pin DIP 300mil : EM78P164ND14J
• 14-pin SOP 150mil : EM78P164NSO14J
• 16-pin DIP 300mil : EM78P164ND16J
• 16-pin SOP 150mil : EM78P164NSO16J