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PIC16F87 Datasheet(PDF) 33 Page - Microchip Technology |
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PIC16F87 Datasheet(HTML) 33 Page - Microchip Technology |
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33 / 214 page  2003 Microchip Technology Inc. Preliminary DS30487B-page 31 PIC16F87/88 EXAMPLE 3-4: ERASING A FLASH PROGRAM MEMORY ROW BANKSEL EEADRH ; Select Bank of EEADRH MOVF ADDRH, W ; MOVWF EEADRH ; MS Byte of Program Address to Erase MOVF ADDRL, W ; MOVWF EEADR ; LS Byte of Program Address to Erase ERASE_ROW BANKSEL EECON1 ; Select Bank of EECON1 BSF EECON1, EEPGD ; Point to PROGRAM memory BSF EECON1, WREN ; Enable Write to memory BSF EECON1, FREE ; Enable Row Erase operation ; BCF INTCON, GIE ; Disable interrupts (if using) MOVLW 55h ; MOVWF EECON2 ; Write 55h MOVLW AAh ; MOVWF EECON2 ; Write AAh BSF EECON1, WR ; Start Erase (CPU stall) NOP ; Any instructions here are ignored as processor ; halts to begin Erase sequence NOP ; processor will stop here and wait for Erase complete ; after Erase processor continues with 3rd instruction BCF EECON1, WREN ; Disable writes BSF INTCON, GIE ; Enable interrupts (if using) |
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