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世纪芯T89C51AC2芯片二次解密分析

时间:2011-04-09 09:04:54

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。
The T89C51AC2 is a high performance Flash version of the 80C51 single chip 8-bit microcontrollers. It contains a 32 KB Flash memory block for program and data. The 32 KB Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin.
 T89C51AC2 Features
· 80C51 Core Architecture
· 256 Bytes of On-chip RAM
· 1 KB of On-chip XRAM
· 32 KB of On-chip Flash Memory
– Data Retention: 10 Years at 85°C
Read/Write Cycle: 10K
· 2 KB of On-chip Flash for Bootloader
· 2 KB of On-chip EEPROM
Read/Write Cycle: 100K
· 14-sources 4-level Interrupts
· Three 16-bit Timers/Counters
· Full Duplex UART Compatible 80C51
·  Maximum Crystal Frequency 40 MHz, in X2 Mode, 20 MHz (CPU Core, 20 MHz)
· Five Ports: 32 + 2 Digital I/O Lines
· Five-channel 16-bit PCA with:
– PWM (8-bit)
– High-speed Output
– Timer and Edge Capture
· Double Data Pointer
· 21-bit Watchdog Timer (7 Programmable Bits)
· 10-bit Resolution Analog to Digital Converter (ADC) with 8 Multiplexed Inputs
· On-chip Emulation Logic (Enhanced Hook System)
· Power Saving Modes:
– Idle Mode
– Power-down Mode
· Power Supply: 3V to 5.5V
· Temperature Range: Industrial (-40° to +85°C)
· Packages: VQFP44, PLCC44
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