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PIC18C442芯片研究与解密分析

时间:2011-01-20 09:00:40

单片机解密过程中,对芯片内部结构及其加解密特征进行技术分析是解密工程师的一项必修课,因为只有充分理解单片机内部结构原理等技术信息,工程师才能准确进行方案开发,确定最可靠、成功率最高的芯片解密方案,最大限度确保解密项目的安全可靠
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High Performance RISC CPU:
· C-compiler optimized architecture/instruction set
- Source code compatible with the PIC16CXX instruction set
· Linear program memory addressing to 2M bytes
· Linear data memory addressing to 4K bytes
· Up to 10 MIPs operation:
- DC - 40 MHz osc./clock input
- 4 MHz  - 10 MHz osc./clock input with PLL active
· 16-bit wide instructions, 8-bit wide data path
· Priority levels for interrupts
· 8 x 8 Single Cycle Hardware Multiplier
Peripheral Features:
· High current sink/source 25 mA/25 mA
· Three external interrupt pins
· Timer0 module: 8-bit/16-bit timer/counter with  8-bit programmable prescaler
· Timer1 module: 16-bit timer/counter
· Timer2 module: 8-bit timer/counter with 8-bit period register (time-base for PWM)
· Timer3 module: 16-bit timer/counter
· Secondary oscillator clock option - Timer1/Timer3
·Two Capture/Compare/PWM (CCP) modules. CCP pins that can be configured as:
- Capture input: capture is 16-bit, max. resolution 6.25 ns (TCY/16)
- Compare is 16-bit, max. resolution 100 ns (TCY)
- PWM output: PWM resolution is 1- to 10-bit.
Max. PWM freq. @:8-bit resolution = 156 kHz
10-bit resolution= 39 kHz
· Master Synchronous Serial Port (MSSP) module.
Two modes of operation:
- 3-wire SPI (supports all 4 SPI modes)
-I2C master and slave mode
· Addressable USART module:
- Supports interrupt on Address bit
· Parallel Slave Port (PSP) module
·Analog Features:
· 10-bit Analog-to-Digital Converter module (A/D) with:
- Fast sampling rate
- Conversion available during sleep
- DNL = ±1 LSb,  INL = ±1 LSb
· Programmable Low-Voltage Detection (LVD) module
- Supports interrupt on low voltage detection
· Programmable Brown-out Reset (BOR)
Special Microcontroller Features:
· Power-on Reset (POR), Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
· Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation
· Programmable code-protection
· Power saving SLEEP mode
· Selectable oscillator options including:
- 4X Phase Lock Loop (of primary oscillator)
- Secondary Oscillator (32 kHz) clock input
· In-Circuit Serial Programming (ICSP?) via two pins
CMOS Technology:
·Low-power, high-speed EPROM technology
· Fully static design
· Wide operating voltage range (2.5V to 5.5V)
· Industrial and Extended temperature ranges
· Low-power consumption

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