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PIC18F4220功能解析与IC解密

时间:2010-08-25 09:07:09

有关PIC18F4220解密,他的一些基本的特征需要我们去了解。在单片机解密、IC解密过程中,不同的技术手法可能产生的解密解密就不同,而解密手法的选择除了考虑解密者本身的技术经验外,还应该对需解密的单片机有一定的了解。
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以下是我们对PIC18F4220芯片的简单介绍供各位参考:

the PIC18FXXJ Flash family of devices has an internalvoltage regulator. This voltage regulator provides a
lower supply voltage to the core of the device than whatis provided to the I/O pins. In devices with a larger pincount (60+ pins), the voltage regulator can be enabled ordisabled externally through the ENVREG pin. This pincan either be tied to VDD to enable the voltage regulatoror pulled to ground to disable the voltage regulator.Figure 1 shows the effective circuit for the larger pincount devices. Notice that the ENVREG pin is presentand that it controls whether the regulator is on or off.In lower pin count devices, such as the PIC18F45J10(see Figure 2), the “F” designation in the name (i.e.,PIC18F45J10) specifies that the internal voltageregulator enable is always tied to VDD and the regulatoris always on. The “LF” designation (i.e.,PIC18LF45J10) specifies that the voltage regulatorenable is always tied to ground and that the regulatorwill always be disabled.
2 x 10-Bit
PWM 40MHz Max.
Speed Internal
RC Oscillator
Self Programming
PSP ICD


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