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