general description the em78p153b is an 8-bit microprocessor designed and developed with low-power and high-speed cmos technology. the device has an on-chip 1024′13-bit electrical one time programmable read only memory (otp-rom). it provides three protection bits to prevent intrusion of user’s otp memory code. fifteen code option bits are also available to meet your special requirements. with enhanced otp-rom features, the em78p153b provides a convenient method of developing and verifying user’s programs. moreover, this otp device offers easy and effective program updates with the use of development and programming tools. you can avail of the elan writer to easily program your development codes. features cpu configuration 1k x 13 bits on-chip rom 32 x8 bits on-chip registers (sram, general purpose) 5 level stacks for subroutine nesting less than 1.5 ma at 5v/4mhz typically 15μa, at 3v/32khz typically 1μa, during sleep mode i/o port configuration 2 bidirectional i/o ports: p5,p6 12 i/o pins wake-up port: p6 6 programmable pull-down i/o pins 7 programmable pull-high i/o pins 7 programmable open-drain i/o pins external interrupt : p60 operating voltage range 2.3v~5.5v at 0°c~70°c (commercial grade) operating frequency range (base on 2 clocks) crystal mode: dc ~ 20 mhz / 2clks @ 5v dc ~ 8 mhz / 2clks @ 3v dc ~ 4 mhz / 2clks @ 2.3v the transient point of system frequency between hxt and lxt is 400 khz. erc mode dc ~ 2 mhz / 2clks @ 2.1v irc mode: oscillation mode : 4 / 8 / 1 mhz and 455khz process deviation: type: max. ± 3% temperature deviation: ± 2% (0 ~ 70°c) internal rc frequency drift rate temperature( 0°c ~70°c ) voltage process total 4 mhz ±1.5% ±8%@2.3~5.5v ±2% ±11.5% 8 mhz ±1.5% ±8%@3.0~5.5v ±2% ±11.5% 1mhz ±1.5% ±8%@2.3~5.5v ±2% ±11.5% 455khz ±1.5% ±8%@2.3~5.5v ±2% ±11.5% peripheral configuration 8bit real time clock/counter (tcc) with selective signal sources, trigger edges, and overflow interruptpower on reset and 3 programmable level voltage reset por: 1.8v (default), lvr: 4.0, 3.5, 2.7v 2 -/ 4 clocks per instruction cycle selected by code option three available interrupts: tcc overflow interrupt input-port status changed interrupt (wake-up from sleep mode) external interrupt special features programmable free running watchdog timer power saving sleep mode selectable oscillation mode programmable prescaler of oscillator set-up time package type: 14-pin dip 300mil : em78p153bd14j 14-pin sop 150mil : em78p153bso14j 10-pin ssop 150mil : em78p153bss10j