MC68HC705X32芯片解密等FREESCALE系列单片机解密是橙盒芯片解密研究所目前已经成功破解的典型单片机系列，针对FREESCALE系列典型单片机，橙盒芯片解密研究所目前已经有较为成熟的技术解决方案，可以针对客户具体的解密需求提供最具可靠性的解密方案。
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本文，我们将针对MC68HC705X32芯片的主要技术特征及其EPROM特征进行技术分析，供广大客户及芯片解密工程师在解密过程中进行技术参考和借鉴，有MC68HC705X32单片机解密需求者欢迎与我们联系咨询更多合作详情
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The MC68HC705X32 is a device similar to the MC68HC05X16, but with 32K bytes of EPROM instead of 16K bytes of ROM. In addition, the bootstrap routines available in the MC68HC05X16 are replaced by bootstrap routines specific to the MC68HC705X32. The entire MC68HC05X16 data sheet applies to the MC68HC705X32, with the exceptions outlined in this appendix.
MC68HC705X32 Features
–40 to +125°C operating temperature range
31232 bytes user EPROM plus 16 bytes of EPROM user vectors
528 bytes of RAM
654 bytes bootstrap ROM
Simultaneous programming of up to 16 bytes of EPROM
4 MHz bus speed
Available in 64-pin QFP package
MC68HC705X32 EPROM
The MC68HC705X32 device has a total of 31248 bytes of EPROM. 16 bytes are used for the reset and interrupt vectors from address $7FF0 to $7FFF. The main EPROM block of 31232 bytes is located from $0400 to $7DFF. One byte of EPROM is used as an option register and is located at address $7FDE.The EPROM can be completely tested before assembly with sequences of both program and erase. It is finally erased before being typically assembled in a package with no erase window.Therefore, only programming is possible and the EPROM operates as a PROM.The EPROM array is supplied by the VPP6 pin in both read and program modes. Typically the user’s software would be loaded into a programming board where VPP6 is controlled by one of the bootstrap loader routines. It would then be placed in an application where no programming occurs.In this case the VPP6 pin should be hardwired to VDD.
The execution of a program in the EPROM address range or a load from the EPROM are both read operations. The E6LAT bit in the EPROM/EEPROM control register should be cleared to ‘0’ which automatically resets the E6PGM bit. In this way the EPROM is read like a normal ROM. Reading the EPROM with the E6LAT bit set will give data that does not correspond to the actual memory content. As interrupt vectors are in EPROM, they will not be loaded when E6LAT is set. Similarly,the bootstrap ROM routines cannot be executed when E6LAT is set. In read mode, the VPP6 pin must be at the VPP6R level. When entering the STOP mode, the EPROM is automatically set to the read mode.
