參數(shù)資料
型號： DV164136
廠商： Microchip Technology
文件頁數(shù)： 5/107頁
文件大小： 0K
描述： DEVELOPMENT KIT FOR PIC18
產品培訓模塊： PIC18 J Series MCU Overview
標準包裝： 1
系列： PIC®
類型： MCU
適用于相關產品： PIC18F8722，PIC18F87J11
所含物品： 板，線纜，CD，PICkit? 3 個編程器，電源
產品目錄頁面： 659 (CN2011-ZH PDF)
相關產品： PIC18F87J11-I/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP
PIC18F87J11T-I/PTTR-ND - IC PIC MCU FLASH 64KX16 80TQFP
PIC18F8722T-E/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP
PIC18F8722-E/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP
PIC18F8722T-I/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP
PIC18F8722-I/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP
PIC18F87J11 FAMILY
DS39778E-page 102
2007-2012 Microchip Technology Inc.
EXAMPLE 7-3:
WRITING TO FLASH PROGRAM MEMORY
MOVLW
CODE_ADDR_UPPER
; Load TBLPTR with the base address
MOVWF
TBLPTRU
; of the memory block, minus 1
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
H'55'
MOVWF
EECON2
; write H'55'
MOVLW
H'AA'
MOVWF
EECON2
; write H'AA'
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_BYTE_TO_HREGS
PROGRAM_MEMORY
BSF
EECON1, WREN
; enable write to memory
BCF
INTCON, GIE
; disable interrupts
MOVLW
H'55'
Required
MOVWF
EECON2
; write H'55'
Sequence
MOVLW
H'AA'
MOVWF
EECON2
; write H'AA'
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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