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PIC18F010 Datasheet(PDF) 53 Page - Microchip Technology |
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PIC18F010 Datasheet(HTML) 53 Page - Microchip Technology |
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53 / 176 page  2001 Microchip Technology Inc. Preliminary DS41142A-page 51 PIC18F010/020 EXAMPLE 6-2: PROGRAM MEMORY WRITE This example will buffer a segment of memory, modify one word in the buffer, erase the segment row, and write the buffer back to memory. MOVLW 32 ; number of bytes in row MOVWF COUNTER MOVLW BUFFER_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW BUFFER_ADDR_LOW ; MOVWF FSR0L MOVLW CODE_ADDR_UPPER ; Load TBLPTR with the base MOVWF TBLPTRU ; address of the memory row MOVLW CODE_ADDR_HIGH ; MOVWF TBLPTRH ; MOVLW CODE_ADDR_LOW ; MOVWF TBLPTRL ; READ_ROW TBLRD*+ ; read into TABLAT, and inc MOVF TABLAT, W ; get data MOVWF POSTINC0 ; store data DECFSZ COUNTER ; done? GOTO READ_ROW ; repeat MODIFY_WORD MOVLW DATA_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW DATA_ADDR_LOW ; MOVWF FSR0L MOVLW NEW_DATA_LOW ; update buffer word MOVWF POSTINC0 MOVLW NEW_DATA_HIGH MOVWF INDF0 ERASE_ROW MOVLW CODE_ADDR_UPPER ; Load TBLPTR with the base MOVWF TBLPTRU ; address of the memory row MOVLW CODE_ADDR_HIGH ; MOVWF TBLPTRH ; MOVLW CODE_ADDR_LOW ; MOVWF TBLPTRL ; BSF EECON1,WREN ; enable write to memory BSF EECON1,FREE ; Enable Row Erase operation BSF EECON1,EEPGD ; Point to FLASH program memory MOVLW 55h MOVWF EECON2 ; write 55H MOVLW AAh MOVWF EECON2 ; write AAH BSF EECON1,WR ; start erase (CPU stall) WRITE_BUFFER_BACK MOVLW 8 ; number of write buffer groups of 4 bytes MOVWF COUNTER_HI MOVLW BUFFER_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW BUFFER_ADDR_LOW ; MOVWF FSR0L TBLRD*- ; back the TBLPTR up one PROGRAM_LOOP MOVLW 4 ; number of bytes in write buffer MOVWF COUNTER |
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