EM78P458 and EM78P459 are 8-bit microprocessors designed and developed with low-power and high-speed CMOS technology. It is equipped with a 4K x 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 EMC Writer to easily program his development code.

• Operating voltage range: 2.3V~5.5V
• Operating temperature range: 0°C~70°C
• Operating frequency range(base on 2 clocks):
  * Crystal mode: DC ~ 20MHz/2clks,5V; DC ~ 8MHz/2clks,3V
  * RC mode: DC ~ 4MHz/2clks,5V; DC ~ 4MHz/2clks,3V
• Low power consumption:
  * Less than 1.5 mA at 5V/4MHz
  * Typically 15 µA, at 3V/32KHz
  * Typically 1 µA, during sleep mode
• 4K x 13 bits on chip ROM
• 84 x 8 bits on chip registers (SRAM)
• 2 bi-directional I/O ports
• 8 level stacks for subroutine nesting
• 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and
• overflow interrupt
• 8-bit multichannel Analog-to-Digital Converter with 8-bit resolution
• Dual Pulse Width Modulation (PWM ) with 10-bit resolution
• One pair of comparators
• 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 interrupt
• Programmable free running watchdog timer
• 8 Programmable pull-down I/O pins
• 7 programmable pull-high I/O pins
• 8 programmable open-drain I/O pins
• Two clocks per instruction cycle
• Package types:
  * 18 pin DIP 300mil : EM78P458BP
  * 18 pin SOP 300mil : EM78P458BM
  * 20 pin DIP 300mil : EM78P458AP
  * 20 pin SOP 300mil : EM78P458AM
  * 24 pin skinny DIP 300mil : EM78P459AK