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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC18F44J10-E/SP 데이터시트(PDF) 76 Page - Microchip Technology |
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PIC18F44J10-E/SP 데이터시트(HTML) 76 Page - Microchip Technology |
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76 / 358 page  PIC18F45J10 FAMILY DS39682C-page 74 Preliminary © 2007 Microchip Technology Inc. EXAMPLE 6-3: WRITING TO FLASH PROGRAM MEMORY MOVLW CODE_ADDR_UPPER ; Load TBLPTR with the base MOVWF TBLPTRU ; address of the memory block MOVLW CODE_ADDR_HIGH MOVWF TBLPTRH MOVLW CODE_ADDR_LOW MOVWF TBLPTRL ERASE_BLOCK BSF EECON1, WREN ; enable write to memory BSF EECON1, FREE ; enable Row Erase operation BCF INTCON, GIE ; disable interrupts MOVLW 55h MOVWF EECON2 ; write 55h MOVLW 0AAh MOVWF EECON2 ; write 0AAh BSF EECON1, WR ; start erase (CPU stall) BSF INTCON, GIE ; re-enable interrupts MOVLW D'16' MOVWF WRITE_COUNTER ; Need to write 16 blocks of 64 to write ; one erase block of 1024 RESTART_BUFFER MOVLW D'64' MOVWF COUNTER MOVLW BUFFER_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW BUFFER_ADDR_LOW MOVWF FSR0L FILL_BUFFER ... ; read the new data from I2C, SPI, ; PSP, USART, etc. WRITE_BUFFER MOVLW D’64 ; number of bytes in holding register MOVWF COUNTER WRITE_BYTE_TO_HREGS MOVFF POSTINC0, WREG ; get low byte of buffer data MOVWF TABLAT ; present data to table latch TBLWT+* ; write data, perform a short write ; to internal TBLWT holding register. DECFSZ COUNTER ; loop until buffers are full BRA WRITE_WORD_TO_HREGS PROGRAM_MEMORY BSF EECON1, WREN ; enable write to memory BCF INTCON, GIE ; disable interrupts MOVLW 55h Required MOVWF EECON2 ; write 55h Sequence MOVLW 0AAh MOVWF EECON2 ; write 0AAh BSF EECON1, WR ; start program (CPU stall) BSF INTCON, GIE ; re-enable interrupts BCF EECON1, WREN ; disable write to memory DECFSZ WRITE_COUNTER ; done with one write cycle BRA RESTART_BUFFER ; if not done replacing the erase block |
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