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PIC16LF877T芯片破解与性能分析

时间:2011-01-14 09:25:37

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PIC16LF877T芯片性能介绍
许多应用需要一个微控制器来计算校验的程序存储器的内容,以确定是否已损坏。到现在为止,只有家人的PICmicro单片机有能力读取程序存储器的PIC17CXXX器件上运行起来PIC16F87X在RST 14位核心的PICmicro微控制器能够以同样的方式访问程序存储器和数据使用EEPROM的memory.These设备是流行的PIC16C7X系列FLASH的扩展。表1显示了两者之间的PICmicro微控制器系列的比较。
The data EEPROM and FLASH Program memory are both accessed using the same method.  An address and/or data value are stored in Special Function Registers (SFR) and then memory is accessed using control bits in other SFRs.  There are six SFRs required to access memory:
·EECON1
·EECON2
·EEDATA
·EEDATH
·EEADR
·EEADRH
When interfacing to data EEPROM memory, the address is stored in the EEADR register and the data is accessed using the EEDATA register.  The operation is controlled using the EECON1 and EECON2 registers.  The register map for EECON1 is shown in Figure 1. EECON2is not a physical register.  Reading it will result in all '0's.This register is used exclusively in the EEPROM and FLASH write sequences. When interfacing to FLASH program memory, the address is stored in the EEADRH:EEADR registers and the data is accessed using the EEDATH:EEDATA registers.  Since the same set of control registers are used to access data and program memory, the  EEPGD bit (EECON1<7>) is used to indicate to the microcontroller
whether the operation is going to be on data memory (EEPGD = 0) or program memory (EEPGD = 1)。  Refer to Section 7.0 in the PIC16F87X data sheet (DS30292)for more information about using the EEPROM and FLASH memories.
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