The EM78P342N is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology. The device has an on-chip 2Kx13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a protection bit to prevent intrusion of user's OTP memory code. Three Code option bits are also available to meet user's requirements.
With enhanced OTP-ROM features, the EM78P342N 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

• 2Kx13 bits on-chip ROM
• 80x8 bits on-chip registers (SRAM)
• 8-level stacks for subroutine nesting
• 4 programmable Level Voltage Detector (LVD) : 4.5V, 4.0V, 3.3V, 2.2V
• 3 programmable Level Voltage Reset (LVR) : 4.0V, 3.5V, 2.4V 
• Less than 1.5 mA at 5V/4MHz
• Typically 15 uA, at 3V/32kHz
• Typically 2 uA, during sleep mode 

• I/O port configuration

• 3 bidirectional I/O ports: P5, P6, P7
• 18 I/O pins
• Wake-up port : P5
• 8 programmable pull-down I/O pins
• 16 programmable pull-high I/O pins
• 8 programmable open-drain I/O pins
• 4 programmable high-sink current I/O pins
• External interrupt : P60

• Operating voltage range: 

• 2.1V~5.5V at 0°C~70°C (commercial)
• 2.3V~5.5V at -40°C~85°C (industrial) 

• Operating frequency range (base on 2 clocks):

• Crystal mode: DC ~ 16MHz, 4.5V; 

DC ~ 8MHz, 3V; DC ~ 4MHz, 2.1V

• ERC mode: DC ~ 16MHz, 4.5V; 

DC ~ 125ns inst. Cycle, 4.5V

DC ~ 8MHz, 3V; DC ~ 250ns inst. Cycle, 3V

• IRC mode 

Oscillation mode: 16MHz, 4MHz, 1MHz, 455kHzn 

Internal RC Frequency	Drift Rate
	Temperature(-40°C~85°C)	Voltage(2.3V~5.5V)	Process	Total
4 MHz	±5%	±5%	±4%	±14%
16 MHz	±5%	±5%	±4%	±14%
1 MHz	±5%	±5%	±4%	±14%
455 kHz	±5%	±5%	±4%	±14%

All the four main frequencies can be trimmed by programming with four calibrated bits in the ICE341N Simulator. OTP is auto trimmed by ELAN Writer.

• Fast set-up time requires only 0.8ms (VDD: 5V Crystal: 4MHz, C1/C2: 30pF) in HXT2 mode and 10ms in IRC mode (VDD: 5V, IRC: 4MHz)
• Peripheral configuration

• Easily implemented IR (infrared remote control)
• 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
• 8-bit real time clock/counter (TCCA, TCCC) and 16-bit real time clock/counter (TCCB) with selective signal sources, trigger edges, and overflow interrupt
• 8-bit multi-channel Analog-to-Digital Converter with 12-bit resolution in Vref mode
• One pair of comparator or OP(offset voltage: smaller than 10mV)

• Seven available interrupts

• TCC, TCCA, TCCB, TCCC overflow interrupt
• Input-port status changed interrupt (wake up from sleep mode)
• External interrupt
• ADC completion interrupt
• IR/PWM period match completion
• Comparator status change interrupt
• Low voltage detect (LVD) interrupt

• Special Features:

• Programmable free running Watchdog Timer(4.5 ms : 18 ms)
• Power saving Sleep mode
• Selectable Oscillation mode
• Power-on voltage detector available (1.7V ± 0.1V)
• High EFT immunity (better performance at 4MHz or below)

• Package Type:

• 14-pin DIP 300mil : EM78P342ND14J/S
• 14-pin SOP 150mil : EM78P342NSO14J/S
• 16-pin SOP 150mil : EM78P342NSO16AJ/S
• 18-pin DIP 300mil : EM78P342ND18J/S
• 18-pin SOP 300mil : EM78P342NSO18J/S
• 20-pin DIP 300mil : EM78P342ND20J/S
• 20 pin SOP 300mil : EM78P342NSO20J/S
• 20 pin SSOP 209mil : EM78P342NSS20J/S