1  General Description 
The EM78P528N is an 8-bit microprocessor designed and developed with low-power, high-speed CMOS 
technology.  It is used for 15 bits kernel simulation and it simulates the 8K×15-bit programmable ROM.  Using the 
ICER400N, users can develop their program for ELAN’s several OTP types of IC. 
2  Features 
„  CPU configuration 
•  Support 8K×15 bits program ROM 
•  (48+512) bytes general purpose register 
•  32 bytes LCD RAM 
•  8-level stacks for subroutine nesting 
•  Less than 1mA at 5V/4MHz 
•  Typically 15 μA at 3V/16kHz 
•  Typically 22 μA, at 3V/32kHz 
•  Typically 2 μA during sleep mode 
•  4 programmable Level Voltage Reset 
LVR: 4.0V, 3.5V, 2.7V, 1.8V (POR) 
•  4 programmable Level Voltage Detector 
LVD: 4.5V, 4.0V, 3.3V, 2.2V 
•  Four CPU operation modes: Normal, Sleep, Green, Idle 
„  I/O port configuration 
•  6 bidirectional I/O ports: P5~P9, PA 
•  4 programmable pin change wake-up ports : P5~P8 
•  6 programmable pull-down I/O ports: P5~P9, PA 
•  6 programmable pull-high I/O ports: P5~P9, PA 
•  6 programmable open-drain I/O ports: P5~P9, PA 
•  6 programmable high-sink/drive I/O ports: P5~P9, PA 
•  10 external interrupt pins 
„  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): 
Main oscillator: 
•  Crystal mode: 
DC~16 MHz at 5V; DC~8 MHz at 3V; DC~4 MHz at 2.1V 
•  IRC mode: 
DC~16 MHz at 5V; DC~8 MHz at 3V; DC~4 MHz at 2.1V  
Drift Rate 
Internal RC 
Frequency 
Temperature  
(-40°C ~+85°C) 
Voltage 
(2.5V~5.5V) 
Process Total
1 MHz  ±2%  ±1%  ±1%  ±4%
4 MHz  ±2%  ±1%  ±1%  ±4%
8 MHz  ±2%  ±1%  ±1%  ±4%
16 MHz  ±2%  ±1%  ±1%  ±4%
 
Sub oscillator: 
•  Crystal mode: 32.768kHz 
•  IRC mode: 16k/32kHz  
„  Peripheral configuration 
•  8-bit real time clock/counter (TCC) with selective 
signal sources and trigger edges 
•  15+1 channels Analog-to-Digital Converter with  
12-bit resolution + 1 internal reference for Vref  
•  LCD: 8×23 dots, bias (1/2, 1/3), duty (static, 1/3,  
1/4, 1/8) 
•  Three 8-bit timers (TC1/TC2/TC3) with six modes:  
Timer/Counter/Capture/Window/Buzzer/PWM/PDO 
(programmable divider output) modes.  Timer 1 and 
Timer 2 can be cascaded to one 16-bit counter/timer 
•  Universal asynchronous receiver/transmitter (UART) 
•  Serial transmitter/receiver interface (SPI): 3-wire 
synchronous communication 
•  I2C function with 7/10-bit address and 8-bit data 
transmit/receive mode 
•  Four programmable watch timer: 1.0 sec, 0.5 sec, 
0.25 sec, 3.91 ms 
•  Power-down (Sleep) mode 
•  High EFT immunity 
„  25 available interrupts (12 external, 13 internal) 
•  10 external interrupts 
•  Input-port status changed interrupt (wake up from  
sleep mode) 
•  LVD interrupt 
•  TCC overflow interrupt 
•  Three timer interrupt 
•  ADC completion interrupt 
•  I2C transfer/receive interrupt 
•  UART TX, RX , RX error interrupt 
•  SPI interrupt 
•  Watch timer interrupt 
„  Single instruction cycle commands 
„  Package Type: 
•  44 pin QFP 10x10mm  :  EM78P528NQ44J/S 
•  44 pin LQFP 10x10mm  :  EM78P528NL44J/S 
•  48 pin LQFP 7x7mm  :  EM78P528NL48J/S 
Note: These are Green Products which do not contain  
hazardous substances.