MC68HC705B16芯片解密——MC68HC系列
MC68HC705B16以及FREESCALE系列（MOTOROLA系列）其他典型的IC芯片解密、单片机解密是芯片解密研究所的优势解密系列之一，本研究所不仅在国内率先突破FREESCALE系列典型单片机解密,，而且长期以来不断针对各种疑难型芯片进行技术 *** 研究，目前，我们能够提供MC68HC全系列单片机解密，且解密周期短、价格合理、解密成功率高、可靠性强，致力于为广大客户提供可信赖的技术支持,。
下面我们将提供对MC68HC705B16芯片的主要功能特征及EPROM特征的简单介绍，供芯片解密工程师、其他各类技术工程师以及芯片解密客户进行技术参考和借鉴，有MC68HC705B16芯片解密等FREESCALE系列单片机解密需求者欢迎与联系咨询更多解密详情
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The MC68HC705B16 is a device similar to the MC68HC05B6, but with increased RAM and 15 kbytes of EPROM instead of 6 kbytes of
MC68HC705B16 Features
15 kbytes EPROM
352 bytes of RAM
576 bytes bootstrap ROM
Simultaneous programming of up to 8 bytes of EPROM
Optional pull-down resistors available on all port B and port C pins
52-pin PLCC and 64-pin QFP packages
High speed version not available
MC68HC705B16 EPROM
The MC68HC705B16 device has a total of 15168 bytes of EPROM (including 14 bytes for User vectors) and 256 bytes of EEPROM.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 VDD level. When entering the STOP mode, the EPROM is automatically set to the read mode.
