EM78451单片机解密

    这里我们提供对EM78451单片机基本功能特征的简单介绍供客户及电子工程师参考，因为在IC解密/单片机解密领域，针对每一款芯片，由于芯片本身的加解密特征及内部结构不同，所需要采用的解密方法与手段也有不同，对单片机本身有一定了解，能够更好的对芯片进行最安全可靠，准确有保证的破解。
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    关于EM78451单片机
　　The EM78451 is an 8-bit microprocessor designed and developed with low-power and high speed CMOS technology. Its operation kernel is implemented with RISC-like architecture, and it is available in the mask ROM version. This device is also equipped with the Serial Peripheral Interface (SPI) function and an easy-implemented RS-232.
The EM78451 is extremely suitable for wired communication. In fact, there are only fifty-eight (58) easy-to-learn instructions required plus the user’s program can be emulated with the EMC In-Circuit Emulator (ICE).
    EM78451单片机特性：
　　Operating voltage ranges between: 2.3V~5.5V.
　　Operating temperature ranges between: 0°C~70°C.
　　Operating frequency ranges between (based on 2 clocks):
　　1Crystal 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 3 mA at 5V/4MHz
　　Typically 10 μA during sleep mode
　　(SPI) Serial Peripheral Interface is also available.
　　4K × 13 bits on chip ROM (EM78451).
　　11 Special function registers.
　　140× 8 bits On- chip general-purpose registers.
　　5 Bi-directional I/O ports (35 I/O pins).
　　3 LED Direct sinking pins with internal serial resistors.
　　Built-in RC oscillator with external serial resistor, ±10% variation.
　　Built-in power-on reset.
　　Five stacks designed for subroutine nesting.
　　8-bit Real time clock/counter (TCC) with overflow interrupt.
　　Two to four machine -clocks for each instruction cycle.
　　Power down mode.
　　I/O ports have a Programmable wake-up function from sleep circuit.
　　Programmable free running on-chip watchdog timer.
　　12 Wake-up pins.