EM78P221N and EM78P222N 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 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
• 3 programmable Level Voltage Reset (LVR) : 4.0V,3.0V,2.5(POR)
• Less than 1.5 Ma at 5V/4MHz
• Typically 15 Ua, at 3V/32KHz
• Typically 2 Ua, during sleep mode

I/O port configuration

• 4 bi-directional I/O ports : P5,P6,P7,P8
• 26 I/O pins
• Wake-up port : P6
• 8 Programmable pull-down I/O pins
• 8 programmable pull-high I/O pins
• 8 programmable open-drain I/O pins
• External interrupt : P77,P71

Operating voltage range

• OTP version: 2.1V ~ 5.5V(commercial)

Operating temperature range

• -40 ~ 85℃

Operating frequency range: Main clock

• Crystal mode:
  * DC ~ 16MHz/2clks @ 4.5V; DC ~ 125ns inst. Cycle @ 4.5V
  * DC ~ 8MHz/2clks @ 3V;DC ~ 250ns inst. Cycle @ 3V
• ERC mode:
  * DC ~ 16MHz/2clks @ 4.5V;DC ~ 125ns inst. Cycle @ 4.5V
  * DC ~ 8MHz/2clks @ 3V;DC ~ 250ns inst. Cycle @ 3V
• IRC mode:
  * Oscillation mode : 16MHz,4MHz,1MHz,455KHz
  * Process deviation : TYP±4%, MAX±5%
  * Temperature deviation : ±5%(-40℃ ~ 85℃)

Peripheral configuration

• 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
• One comparator (The offset for one of them is small than 10mV. )

Five available interruptions

• TCC overflow interrupt
• Input-port status changed interrupt (wake-up from sleep mode)
• Two External interrupt
• One timer match the period of corresponding PWM
• Comparator high/low interrupt

Special features

• Programmable free running watchdog timer
• Two clocks per instruction cycle
• Power on Reset
• High EFT immunity
• Power saving Sleep mode
• Selectable Oscillation mode

Package types

• 24 pin skinny DIP 300mil: EM78P221NK
• 24 pin SOP 300mil: EM78P221NM
• 24 pin SSOP 209 mil: EM78P221NAM
• 28 pin skinny DIP 300mil: EM78P222NP
• 28 pin SOP 300mil: EM78P222NM
• 28 pin SSOP 209mil: EM78P222NAM