Transcription of Calculating Program Memory Checksums Using a PIC16F87X
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Calculating Program Memory Checksums Using a PIC16F87X
1998 Microchip Technology 1 M INTRODUCTION Many applications require the microcontroller to cal-culate a checksum on the Program Memory to deter-mine if the contents have been corrupted. Until now,the only family of PICmicro microcontrollers to havethe capability to read from Program Memory are thePIC17 CXXX devices. The PIC16F87X devices arethe first 14-bit core PICmicro microcontrollers thatare able to access Program Memory in the samefashion as used with data EEPROM Memory . Thesedevices are FLASH extensions of the popularPIC16C7X family. Table 1 shows a comparisonbetween the two PICmicro microcontroller families. TABLE 1: PIC16C7X vs. PIC16F87X ACCESSING Memory The data EEPROM and FLASH Program Memory areboth accessed Using the same method.
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