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EM78450解密

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    关于EM78450
    The EM78450 is an 8-bit microprocessor developed with low-power, high speed CMOS technology.Integrated into a single chip, are on-chip watchdog timer (WDT), RAM, ROM, real time clock/counter,power down mode, and bi-directional tri-state I/O ports. It is most suited for keyboard encoder development and other related applications.
  EM78450 FEATURE
  Operating voltage range: 2.3V~4V, 4V ~ 5.5V option by code.
  Operating temperature range: 0°C ~ 70°C.
  Operating frequency range (base on 2 clocks ):
  * Crystal Type : DC ~ 20MHz at 5V, DC ~ 8MHz at 3V and DC ~ 4MHz at 2.3V.
  * RC Type : DC ~ 4MHz at 5V, DC ~ 4MHz at 3V and DC ~ 4MHz at 2.3V.
  Low power consumption:
  * Less then 3 mA at 5V/4MHz
  * Typically 10 mA during sleep mode
  4K x 13 on chip ROM.
  11 special function registers.
  146 × 8 on chip general purpose registers.
  5 bi-directional I/O ports (35 I/O pins).
  3 LED direct sink pins with internal serial resistor, option by code.
  One interrupt pin available.
  Built-in RC oscillator with external serial resistor, ±10% variation.
  Built-in power on reset.
  5 level stacks for subroutine nesting.
  8-bit real time clock/counter (TCC) with overflow interrupt.
  Options for two oscillator cycle or four oscillator cycle per instruction.
  Power down mode.
  Programmable wake up from sleep circuit on I/O ports.
  Programmable free running on-chip watchdog timer.
  12 wake-up pins.
  2 open-drain pins.
  2 R-option pins.
  Two types of interrupts:
  * External interrupt (/INT).
  * TCC overflow interrupt.
  Package:
  * 40 pins DIP 600mil: EM78450P