EM78P345N, EM78P346N and EM78P347N are 8-bit microprocessors designed and developed with low-power and high-speed CMOS technology. It is equipped with a 4K * 13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). With its OTP-ROM feature, it is able to offer a convenient way of developing and verifying user’s programs. Moreover, user can take advantage of ELAN Writer to easily program his development code.

Features

CPU configuration

• 4K x 13 bits on-chip ROM
• 144 x 8 bits on-chip registers (SRAM)
• 8 level stacks for subroutine nesting
• 4 programmable Level Voltage Detector (LVD) : 4.5V, 4.0V,3.3V,2.3V
• 4 programmable Level Voltage Reset (LVR) : 4.0V,3.5V,2.7V(POR)
• Less than 1.5 mA at 5V/4MHz
• Typically 15 µA, at 3V/32KHz
• Typically 2 µA, during sleep mode

I/O port configuration

• 3 bi-directional I/O ports
• Wake-up port : P6
• 21 Programmable pull-down I/O pins
• 21 programmable pull-high I/O pins
• 22 programmable open-drain I/O pins
• External interrupt : P50

Operating voltage range: 

• 1.9V~5.5V at 0℃~70℃(commercial)
• 2.1V~5.5V at -40℃~85℃(industrial) 

Operating frequency range(base on 2 clocks):

• Crystal mode: DC ~ 20MHz,4V; DC ~ 16MHz,3V; DC ~ 4MHz,1.9V
• RC mode: DC ~ 20MHz,4V; DC ~ 16MHz,3V; DC ~ 4MHz,1.9V
• Internal RC Drift Rate (Ta=25℃, VDD=5V±5%, VSS=0V) 

  Internal RC Frequency	Temperature  (-40℃~+85℃)	Voltage (2.3V~5.5V)	Process	Total
  4MHz	±5%	±5%	±4%	±14%
  16MHz	±5%	±5%	±4%	±14%
  1MHz	±5%	±5%	±4%	±14%
  455MHz	±5%	±5%	±4%	±14%

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 12-bit resolution
• Three Pulse Width Modulation (PWM ) with 10-bit resolution
• One pair of comparator (offset voltage 5mV)
• One pair of OP (offset voltage 5mV)
• Power-down (SLEEP) mode

Six available interruptions

• TCC overflow interrupt
• Input-port status changed interrupt (wake up from the sleep mode)
• External interrupt
• ADC completion interrupt
• PWM period match completion
• Comparator high/low interrupt

Programmable free running watchdog timer

• watchdog timer 16.5ms ± 5% in Vdd =5V
  at 25℃ ,Temperature range ± 5% (-40℃~+85℃)
• watchdog timer 18ms ± 5% in Vdd =3V at
  25℃ ,Temperature range ± 5% (-40℃~+85℃)
• Two clocks per instruction cycle

Package types: 

• 18 pin DIP 300mil : EM78P345NPxS/xJ
• 18 pin SOP 300mil : EM78P345NMxS/xJ
• 20 pin DIP 300mil : EM78P346NPxS/xJ
• 20 pin SOP 300mil : EM78P346NMxS/xJ
• 20pin SSOP 209mil: EM78P346NKMxS/xJ
• 24 pin skinny DIP 300mil : EM78P347NPxS/xJ
• 24 pin SOP 300mil : EM78P347NMxS/xJ
• 24 pin SSOP 150mil : EM78P347NKMxS/Xj
  * S/J: Green products  not containing hazardous substance