PIC10F320T-EMCSQTP datasheet(66/210 Pages) MICROCHIP

66 / 210 page

PIC10(L)F320/322

DS41585A-page 66

Preliminary

 2011 Microchip Technology Inc.

EXAMPLE 9-3:

WRITING TO FLASH PROGRAM MEMORY

; This write routine assumes the following:

; 1. 64 bytes of data are loaded, starting at the address in DATA_ADDR

; 2. Each word of data to be written is made up of two adjacent bytes in DATA_ADDR,

; stored in little endian format

; 3. A valid starting address (the least significant bits = 00000) is loaded in ADDRH:ADDRL

; 4. ADDRH and ADDRL are located in shared data memory 0x70 - 0x7F (common RAM)

;

BCF

INTCON,GIE

; Disable ints so required sequences will execute properly

BANKSEL

PMADRH

; not required on devices with 1 Bank of SFRs

MOVF

ADDRH,W

; Load initial address

MOVWF

PMADRH

;

MOVF

ADDRL,W

;

MOVWF

PMADRL

;

MOVLW

LOW DATA_ADDR

; Load initial data address

MOVWF

FSR0

;

BCF

PMCON1,CFGS

; Not configuration space

BSF

PMCON1,WREN

; Enable writes

BSF

PMCON1,LWLO

; Only Load Write Latches

LOOP

MOVIW

FSR0++

; Load first data byte into lower

MOVWF

PMDATL

;

MOVIW

FSR0++

; Load second data byte into upper

MOVWF

PMDATH

;

MOVF

PMADRL,W

; Check if lower bits of address are '00000'

XORLW

0x1F

; Check if we're on the last of 16 addresses

ANDLW

0x1F

;

BTFSC

STATUS,Z

; Exit if last of 16 words,

GOTO

START_WRITE

;

MOVLW

55h

; Start of required write sequence:

MOVWF

PMCON2

; Write 55h

MOVLW

0AAh

;

MOVWF

PMCON2

; Write AAh

BSF

PMCON1,WR

; Set WR bit to begin write

NOP

; NOP instructions are forced as processor

; loads program memory write latches

NOP

;

INCF

PMADRL,F

; Still loading latches Increment address

GOTO

LOOP

; Write next latches

START_WRITE

BCF

PMCON1,LWLO

; No more loading latches - Actually start Flash program

; memory write

MOVLW

55h

; Start of required write sequence:

MOVWF

PMCON2

; Write 55h

MOVLW

0AAh

;

MOVWF

PMCON2

; Write AAh

BSF

PMCON1,WR

; Set WR bit to begin write

NOP

; NOP instructions are forced as processor writes

; all the program memory write latches simultaneously

NOP

; to program memory.

; After NOPs, the processor

; stalls until the self-write process in complete

; after write processor continues with 3rd instruction

BCF

PMCON1,WREN

; Disable writes

BSF

INTCON,GIE

; Enable interrupts

PIC10F320T-EMCSQTP Folha de dados(PDF) 66 Page - Microchip Technology

PIC10F320T-EMCSQTP Folha de dados(HTML) 66 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Folha de dados Download

Ligação URL