General Description

EM78P447S is an 8-bit microprocessor with low-power and high-speed CMOS technology. It is equipped with 4K x 13-bits Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a PROTECTION bit to prevent user’s code in the OTP memory from being intruded. Seven OPTION bits are also available to meet user’s requirements. With its OTP-ROM feature, the EM78P447S 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
?	Operating voltage range: 2.3V~5.5V. 
?	Operating temperature range: -40°C~85°C. 
?	Operating frequency range( base on 2 clocks)
* Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.3V.
* RC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.3V. 
?	Low power consumption:
* Less then 2.2 mA at 5V/4MHz
* Typically 30 μA, at 3V/32KHz
* Typically 1 μA, during sleep mode 
?	4K x 13 bits on chip ROM 
?	One security register to prevent intrusion of OTP memory codes 
?	One configuration register to accommodate user’s requirements 
?	148× 8 bits on chip registers(SRAM, general purpose register) 
?	3 bi-directional I/O ports 
?	5 level stacks for subroutine nesting 
?	8-bit real time clock/counter (TCC) with selective ** sources, trigger edges, and 
?	overflow interrupt 
?	Two clocks per instruction cycle 
?	Power down (SLEEP) mode 
?	Two available interruptions
* TCC overflow interrupt
* External interrupt 
?	Programmable free running watchdog timer 
?	10 programmable pull-high pins 
?	2 programmable open-drain pins 
?	2 programmable R-option pins 
?	Package types:
* 20 pin DIP 300 mil : EM78P447SDP
* 20 pin SOP 300 mil : EM78P447SDM
* 24 pin Skinny DIP 300 mil : EM78P447SCK
* 24 pin SOP 300 mil : EM78P447SCM
* 28 pin DIP 600 mil : EM78P447SAP
* 28 pin Skinny DIP 300 mil : EM78P447SAK
* 28 pin SOP (SOIC) 300 mil : EM78P447SAM
* 28 pin SSOP 209 mil : EM78P447SAS
* 32 pin DIP 600 mil : EM78P447SBP
* 32 pin SOP (SOIC) 450 mil : EM78P447SBWM 
?	99.9% single instruction cycle commands 
?	The transient point of system frequency between HXT and LXT is around 400KHz 
 

 



 

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