FREESCALE芯片解密

    MC68HC705B5芯片解密等FREESCALE系列单片机解密时芯片解密研究所在芯片解密技术研究中的优势解密系列之一，依靠多年来在IC解密、MCU单片机解密、DSP芯片解密等技术研究领域的丰富经验，我们能够针对MC68HC705B5等每一款典型单片机提供最安全可靠的解密服务。
    在芯片解密过程中，解密工程师一般需要对芯片内部的结构特征及加解密性质进行技术理解和分析，以方便其选择最合适的解密方案，为此，这里我们将针对MC68HC705B5单片机的功能特征及其EPROM性质进行技术分析，供大家参考借鉴。
如果客户有MC68HC705B5解密等MC68HC系列单片机解密需求，请与芯片解密研究所联系咨询更多解密详情
The MC68HC705B5 is a device similar to the MC68HC05B6, but with the 6 kbytes ROM and 256 bytes EEPROM replaced by a single EPROM array. In addition, the self-check routines available on the MC68HC05B6 are replaced by bootstrap firmware. The MC68HC705B5 is intended to operate as a one time programmable (OTP) version of the MC68HC05B6 without EEPROM or the MC68HC05B4, meaning that the application program can never be erased once it has been loaded into the EPROM. The entire MC68HC05B6 data sheet applies to the MC68HC705B5, with the exceptions outlined in this appendix.
　　MC68HC705B5 Features
　　6206 bytes EPROM (including 14 bytes User vectors)
　　No EEPROM
　　Bootstrap firmware
　　Simultaneous programming of up to 4 bytes
　　Data protection for program code
　　Optional pull-down resistors on port B and port C
　　MC68HC05B6 mask options are programmable using control bits held in the options register
　　52-pin PLCC and 56-pin SDIP packages
High speed version not available
MC68HC705B5 EPROM
　　The MC68HC705B5 has a total of 6206 bytes of EPROM, 256 bytes being reserved for the EPROM1 array (see Figure C-2). The EPP bit (EPROM protect) is not operative on the EPROM1 array, making it possible to program it after the main EPROM has been programmed and protected. The reset and interrupt vectors are located at $1FF2-$1FFF and the EPROM control register described in Section C.3.1 is located at address $0007.
　　The EPROM array is supplied by the VPP6 pin in both read and programming modes. Typically the user’s software will be loaded in a programming board where VPP6 is controlled by one of the bootstrap loader routines (bootloader mode). It will then be placed in an application where no programming occurs (user mode). In this case the VPP6 pin should be hardwired to VDD.