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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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18F8680 датащи(PDF) 91 Page - Microchip Technology |
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18F8680 датащи(HTML) 91 Page - Microchip Technology |
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91 / 496 page  2004 Microchip Technology Inc. DS30491C-page 89 PIC18F6585/8585/6680/8680 5.5 Writing to Flash Program Memory The minimum programming block is 4 words or 8 bytes. Word or byte programming is not supported. Table writes are used internally to load the holding registers needed to program the Flash memory. There are eight holding registers used by the table writes for programming. Since the Table Latch (TABLAT) is only a single byte, the TBLWT instruction has to be executed 8 times for each programming operation. All of the table write operations will essentially be short writes because only the holding registers are written. At the end of updating eight registers, the EECON1 register must be written to, to start the programming operation with a long write. The long write is necessary for programming the inter- nal Flash. Instruction execution is halted while in a long write cycle. The long write will be terminated by the internal programming timer. The EEPROM on-chip timer controls the write time. The write/erase voltages are generated by an on-chip charge pump, rated to operate over the voltage range of the device for byte or word operations. FIGURE 5-5: TABLE WRITES TO FLASH PROGRAM MEMORY Holding Register TABLAT Holding Register TBLPTR = xxxxx7 Holding Register TBLPTR = xxxxx1 Holding Register TBLPTR = xxxxx0 8 8 8 8 Write Register TBLPTR = xxxxx2 Program Memory |
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