PIC18LF24K Datasheet, PDF (135/594 Pages) –

PIC18(L)F26/45/46K40
EXAMPLE 11-4: WRITING TO PROGRAM FLASH MEMORY
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
READ_BLOCK
TBLRD*+
MOVF
MOVWF
DECFSZ
BRA
MODIFY_WORD
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
ERASE_BLOCK
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
BCF
BSF
BSF
BSF
BCF
MOVLW
Required
MOVWF
Sequence
MOVLW
MOVWF
BSF
BSF
TBLRD*-
MOVLW
MOVWF
MOVLW
MOVWF
WRITE_BUFFER_BACK
MOVLW
MOVWF
MOVLW
MOVWF
D'64’
COUNTER
BUFFER_ADDR_HIGH
FSR0H
BUFFER_ADDR_LOW
FSR0L
CODE_ADDR_UPPER
TBLPTRU
CODE_ADDR_HIGH
TBLPTRH
CODE_ADDR_LOW
TBLPTRL
TABLAT, W
POSTINC0
COUNTER
READ_BLOCK
BUFFER_ADDR_HIGH
FSR0H
BUFFER_ADDR_LOW
FSR0L
NEW_DATA_LOW
POSTINC0
NEW_DATA_HIGH
INDF0
CODE_ADDR_UPPER
TBLPTRU
CODE_ADDR_HIGH
TBLPTRH
CODE_ADDR_LOW
TBLPTRL
NVMCON1, NVMREG0
NVMCON1, NVMREG1
NVMCON1, WREN
NVMCON1, FREE
INTCON, GIE
55h
NVMCON2
AAh
NVMCON2
NVMCON1, WR
INTCON, GIE
BUFFER_ADDR_HIGH
FSR0H
BUFFER_ADDR_LOW
FSR0L
BlockSize
COUNTER
D’64’/BlockSize
COUNTER2
; number of bytes in erase block
; point to buffer
; Load TBLPTR with the base
; address of the memory block
; read into TABLAT, and inc
; get data
; store data
; done?
; repeat
; point to buffer
; update buffer word
; load TBLPTR with the base
; address of the memory block
; point to Program Flash Memory
; point to Program Flash Memory
; enable write to memory
; enable Erase operation
; disable interrupts
; write 55h
; write 0AAh
; start erase (CPU stall)
; re-enable interrupts
; dummy read decrement
; point to buffer
; number of bytes in holding register
; number of write blocks in 64 bytes
 2016 Microchip Technology Inc.
Preliminary
DS40001816C-page 135