PIC18LF4420T-I/SO 查看數據表（PDF） - Microchip Technology
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PIC18LF4420T-I/SO
Microchip Technology
PIC18LF4420T-I/SO Datasheet PDF : 390 Pages
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PIC18F2420/2520/4420/4520
EXAMPLE 6-3: WRITING TO FLASH PROGRAM 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
BSF
BCF
BSF
BSF
BCF
MOVLW
Required
MOVWF
Sequence
MOVLW
MOVWF
BSF
BSF
TBLRD*-
MOVLW
MOVWF
MOVLW
MOVWF
WRITE_BUFFER_BACK
MOVLW
MOVWF
WRITE_BYTE_TO_HREGS
MOVFF
MOVWF
TBLWT+*
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
DATA_ADDR_HIGH
FSR0H
DATA_ADDR_LOW
FSR0L
NEW_DATA_LOW
POSTINC0
NEW_DATA_HIGH
INDF0
CODE_ADDR_UPPER
TBLPTRU
CODE_ADDR_HIGH
TBLPTRH
CODE_ADDR_LOW
TBLPTRL
EECON1, EEPGD
EECON1, CFGS
EECON1, WREN
EECON1, FREE
INTCON, GIE
55h
EECON2
0AAh
EECON2
EECON1, WR
INTCON, GIE
BUFFER_ADDR_HIGH
FSR0H
BUFFER_ADDR_LOW
FSR0L
D’64
COUNTER
POSTINC0, WREG
TABLAT
DECFSZ
BRA
COUNTER
WRITE_WORD_TO_HREGS
; 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 Flash program memory
; access Flash program memory
; enable write to memory
; enable Row 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
; get low byte of buffer data
; present data to table latch
; write data, perform a short write
; to internal TBLWT holding register.
; loop until buffers are full
DS39631A-page 80
Preliminary
2004 Microchip Technology Inc.
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