General Description
The EM78P520N is an 8-bit RISC type microprocessor with low power, high speed CMOS technology. Integrated onto a single chip are on-chip Watchdog Timer (WDT), LCD Data RAM, ROM, programmable real time clock counter, internal / external interrupt, power down mode, 12 bits A/D Converter, UART, SPI, 8-channel LED driver, LCD driver and tri-state I/O.



 
Features
CPU Configuration
8K x 13 bits on-chip ROM
272x8 bits on-chip registers (SRAM)
8-level stacks for subroutine nesting
Dual clock operation or PLL operation mode
Four operation mode: Normal, Green, Idle, Sleep
Four programmable Level Voltage Detector (LVD) : 3.9V, 3.3V, 2.7V, 2.4V
Four programmable Level Voltage Reset (LVR) : 3.9V, 3.3V, 2.6V, 2.1V(POR)
Less than 2.1 mA at 5V/4MHz
Typically 22 uA, at 3V/32kHz
Typically 8 uA, during sleep mode
Single Instruction Cycle Commands
I/O Port Configuration
6 bi-directional I/O ports : P7, P8, P9, PA, PB, PC
43 I/O pins
8-pin Direct Drive LED
39 Programmable open-drain I/O pins
43 programmable pull-high I/O pins
External interrupt : P74~P77, PB0~PB3, P82~P83
Operating voltage range: 
OTP version:

Operating voltage range : 2.3V~5.5V
Operating temperature range : -40~85°C
Operating frequency range:
Crystal/RC oscillation circuit selected by code option for system clock
32.768kHz crystal/RC oscillation circuit selected by code option for sub-oscillatio
Main Clock

Crystal mode: 
DC~20MHz/2 clks @ 5V; DC~100ns inst. Cycle @ 5V

DC~8MHz/2 clks @ 3V; DC~250ns inst. Cycle @ 3V

DC~4MHz/2 clks @ 2.3V; DC~500ns inst. Cycle @ 2.3V

ERIC mode: 
DC~2.2MHz/2 clks @ 2.3V; DC~909ns inst. Cycle @ 2.3V

PLL mode: 
DC~16MHz/2 clks @ 5V; DC~125ns inst Cycle @ 5V

Sub Clock

Crystal mode: 32.768kHz
ERIC mode: 33kHz (2.2MW)
Peripheral Configuration
Serial peripheral interface (SPI) available
8-bit real time clock/counter (TCC)
12-channels Analog-to-Digital Converter with 12-bit resolution in Vref mode
LCD: 8x23 dots, bias (1/2, 1/3, 1/4), duty (static, 1/3, 1/4, 1/8)
Two 8-bit timers
8-bit Timer 1, auto reload counter/timer which can be an interrupt source. Function mode; Timer, Toggle output, UART baud rate generator, Capture, PWM
8-bit Timer 2, auto reload timer which can be aninterrupt source. Function mode; Timer, SPI baud rate generator, PWM
Two sets of 8 bits auto reload counter/timer which can be cascaded to one 16-bit counter/timer
Universal asynchronous receiver / transmitter (UART) available
Four programmable watch timer: 1.0 sec, 0.5 sec, 0.25sec, 3.91ms
Four programmable buzzer output: 0.5kHz, 1kHz, 2kHz, 4kHzn 
Eighteen available interrupts:
TCC overflow interrupt
Ten External interrupts 
(wake-up from sleep mode)

ADC completion interrupt
Two timer interrupt
Watch timer interrupt
Two serial I/O interrupt
Low voltage detect (LVD)
Special Features
Programmable free running watchdog timer
High ESD immunity
High EFT immunity
Power saving Sleep mode
Selectable Oscillation mode
Package Type:
32 pin SDIP 400mil : EM78P520NK32AJ/S
32 pin SOP 450mil : EM78P520NSO32J/S
44 pin QFP 10x10mm : EM78P520NQ44J/S
44 pin LQFP 10x10mm : EM78P520NL44J/S
48 pin LQFP 7x7mm : EM78P520NL48J/S
Note: Green product do not contain hazardous substances

 
Applications
Remote control for air conditioner
Health care
Home appliance