国内权威NEC芯片解密技术——UPD78F0233解密实例分析

　　在不断提升的解密技术手法及26年服务经验，橙盒科技每一位员工本着为客户提供最具竞争力的产品技术服务为宗旨，为每位需求客户量身打造高效快速、价格优惠、风险低的项目研发、二次开发、技术资料提取、芯片解密、单片机解密等技术服务。
　　UPD78F0233芯片主要特性指标介绍，供广大客户及其他解密需求者参考借鉴：
　　1.  Memory Spaces
　　The 78K/0 Series product program memory map varies depending on the internal memory capacity.  For detailsof memory-mapped address area, refer to the user’s manual of each product.
　　2.  Internal Program Memory (Internal ROM) Space
　　Each 78K/0 Series product has internal ROM in the address space.  Program and table data, etc. are storedin the ROM.  Normally, this memory space is addressed by the program counter (PC).  For details of the internalROM space, refer to the user’s manual of each product.
　　3. Vector Table Area
　　The 64-byte area 0000H to 003FH is reserved as a vector table area.  The program start addresses for branchupon RESET input or interrupt request generation are stored in the vector table area.  Of the 16-bit address, thelower 8 bits are stored at even addresses and the higher 8 bits are stored at odd addresses.  For the vector table
　　area, refer to the user’s manual of each product.
　　4. CALLT Instruction Table Area
　　The 64-byte area 0040H to 007FH can store the subroutine entry address of a 1-byte call instruction (CALLT).
　　5. CALLF Instruction Entry Area
　　The 2048-byte area 0800H to 0FFFH can perform a direct subroutine call with a 2-byte call instruction (CALLF).
　　6. Internal Data Memory (Internal RAM) Space
　　78K/0 Series products incorporate the following RAMs.  For details of these RAMs, refer to the user’s manualof each product.
　　(1) Internal high-speed RAM
　　Each 78K/0 Series product incorporates an internal high-speed RAM.  In the 32-byte area FEE0H to FEFFHof these areas, 4 banks of general-purpose registers, each bank consisting of eight 8-bit registers, areallocated.
　　The internal high-speed RAM can also be used as a stack memory.
　　(2) Buffer RAM
　　There are some products in the 78K/0 Series to which buffer RAM is allocated.  This RAM is used to storethe transfer/receive data of serial interface channel 1 (3-wire serial I/O mode with automatic transfer/receivefunction).  If not used in this mode, the buffer RAM can also be used as an ordinary RAM area.
　　(3) RAM for VFD display
　　There are some products in the 78K/0 Series to which RAM for VFD display is allocated.  This RAM canalso be used as an ordinary RAM area.
　　(4) Internal expansion RAM
　　There are some products in the 78K/0 Series to which internal expansion RAM is allocated.
　　(5) RAM for LCD display
　　There are some products in the 78K/0 Series to which RAM for LCD display is allocated.  This RAM canalso be used as an ordinary RAM area.
　　深圳橙盒科技有限公司是一家提供自系统到芯片完整竞争力分析（Complete Competitive Analysis）的高科技公司。我们时刻以客户需求为终极目标，以追求完美为前进动力，以精益求精为工作准则，致力于为广大客户提供最优质、最全面的服务。
　　（温馨提示：所有NEC芯片解密技术服务仅限合法商业用途，诚挚技术服务！）
　　橙盒NEC芯片解密咨询电话：0755-82173891，82175584
　　NEC系列服务咨询QQ:418219082，1315031281
　　Email：chkeji@126.com