GENERAL DESCRIPTION 

EM78P508 is an 8-bit microprocessor with low-power and high-speed CMOS technology. It 

is  equipped  with  a  1024*13-bits  Electrical  One  Time  Programmable  Read  Only  Memory 
(OTP-ROM) within it. It provides a PROTECHION bit to prevent intrusion of user’s code in 
the OTP memory as well as 15 OPTION bits to match user’s requirement. 
 
With its OTP-ROM feature, the FM78P508 offers users a convenient way of developing and 
verifying their programs. Moreover, user developed code can be easily programmed with the 

ELAN writer. 

 ※  8-lead packages:FM78P508EE02 SOP8/DIP8

     ※  Operating voltage range:2.3V～5.5V

     ※  Available in temperature range:0℃～70℃

     ※  Operating frequency range (base on 2 clocks):

         ● Crystal mode: DC～20MHz at 5V, DC～8MHz at 5V, DC～4MHz at 2.3V

         ● ERC mode: DC～4MHz at 5V, DC～4MHz at 3V, DC～4MHz at 2.3V

 

     ※  Low power consumption:

         ● less than 1.5mA at 5V/4MHz

         ● typical of 15μA, at 3V/32KHz

         ● typical of 1μA, during the sleep mode

     ※  1024×13 bits on chip ROM

     ※  Built in EEPROM 24C02

     ※  Built-in calibrate IRC oscillators (8MHz, 4MHz, 1MHz, 455KHz)

※  Programmable prescaler of oscillator set-up time

※  One security register to prevent the code in the OTP memory from intruding

※  One configuration register to match the user’s requirements

※  32×8 bits on chip registers (SRAM, general purpose register)

※  1 bi-directional I/O ports

※  5 level stacks for subroutine nesting

※  8-bits real time clock/counter (TCC) with selective signal sources and trigger edges, and with overflow interrupt

※  Three available interruptions

         ● TCC overflow interrupt

         ● Input-port status changed interrupt (wake up from the sleep mode)

    ● External interrupt

FM78P508EE02