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PIC18F2525 Datasheet(PDF) 88 Page - Microchip Technology

Part # PIC18F2525
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F2525 Datasheet(HTML) 88 Page - Microchip Technology

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PIC18F2525/2620/4525/4620
DS39626E-page 86
© 2008 Microchip Technology Inc.
EXAMPLE 7-3:
WRITING TO FLASH PROGRAM MEMORY
MOVLW
D'64
; number of bytes in erase block
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 block
MOVLW
CODE_ADDR_HIGH
MOVWF
TBLPTRH
MOVLW
CODE_ADDR_LOW
MOVWF
TBLPTRL
READ_BLOCK
TBLRD*+
; read into TABLAT, and inc
MOVF
TABLAT, W
; get data
MOVWF
POSTINC0
; store data
DECFSZ
COUNTER
; done?
BRA
READ_BLOCK
; 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_BLOCK
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
BSF
EECON1, EEPGD
; point to Flash program memory
BCF
EECON1, CFGS
; access Flash program memory
BSF
EECON1, WREN
; enable write to memory
BSF
EECON1, FREE
; enable Row Erase operation
BCF
INTCON, GIE
; disable interrupts
MOVLW
55h
Required
MOVWF
EECON2
; write 55h
Sequence
MOVLW
0AAh
MOVWF
EECON2
; write 0AAh
BSF
EECON1, WR
; start erase (CPU stall)
BSF
INTCON, GIE
; re-enable interrupts
TBLRD*-
; dummy read decrement
MOVLW
BUFFER_ADDR_HIGH
; point to buffer
MOVWF
FSR0H
MOVLW
BUFFER_ADDR_LOW
MOVWF
FSR0L
WRITE_BUFFER_BACK
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


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