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PIC18F8620 Datasheet

  • PIC18F8620

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 3273.72KB

  • 380頁(yè)

  • Microchip   Microchip

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PIC18F6520/8520/6620/8620/6720/8720
EXAMPLE 5-3:
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
MOVWF
Required
MOVLW
Sequence
MOVWF
BSF
NOP
BSF
TBLRD*-
WRITE_BUFFER_BACK
MOVLW
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
PROGRAM_LOOP
MOVLW
MOVWF
WRITE_WORD_TO_HREGS
MOVFF
TBLWT+*
DECFSZ COUNTER
BRA
WRITE_WORD_TO_HREGS
CODE_ADDR_UPPER
TBLPTRU
CODE_ADDR_HIGH
TBLPTRH
CODE_ADDR_LOW
TBLPTRL
EECON1, EEPGD
EECON1, CFGS
EECON1, WREN
EECON1, FREE
INTCON, GIE
55h
EECON2
AAh
EECON2
EECON1, WR
INTCON, GIE
; load TBLPTR with the base
; address of the memory block
DATA_ADDR_HIGH
FSR0H
DATA_ADDR_LOW
FSR0L
NEW_DATA_LOW
POSTINC0
NEW_DATA_HIGH
INDF0
; point to buffer
TABLAT, W
POSTINC0
COUNTER
READ_BLOCK
;
;
;
;
;
read into TABLAT, and inc
get data
store data
done?
repeat
D鈥?4
COUNTER
BUFFER_ADDR_HIGH
FSR0H
BUFFER_ADDR_LOW
FSR0L
CODE_ADDR_UPPER
TBLPTRU
CODE_ADDR_HIGH
TBLPTRH
CODE_ADDR_LOW
TBLPTRL
; number of bytes in erase block
; point to buffer
; Load TBLPTR with the base
; address of the memory block
; update buffer word
;
;
;
;
;
point to Flash program memory
access Flash program memory
enable write to memory
enable Row Erase operation
disable interrupts
; write 55H
; write AAH
; start erase (CPU stall)
; re-enable interrupts
; dummy read decrement
; number of write buffer groups of 8 bytes
; point to buffer
8
COUNTER_HI
BUFFER_ADDR_HIGH
FSR0H
BUFFER_ADDR_LOW
FSR0L
8
COUNTER
POSTINC0, WREG
; 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
DS39609B-page 68
錚?/div>
2004 Microchip Technology Inc.

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