參數(shù)資料
型號: PIC18F45J50-I/PT
廠商: Microchip Technology
文件頁數(shù): 15/164頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 32K 2V 44-TQFP
產(chǎn)品培訓(xùn)模塊: XLP Deep Sleep Mode
PIC18 J Series MCU Overview
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 160
系列: PIC® XLP™ 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 48MHz
連通性: I²C,SPI,UART/USART,USB
外圍設(shè)備: 欠壓檢測/復(fù)位,DMA,POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
RAM 容量: 3.8K x 8
電壓 - 電源 (Vcc/Vdd): 2.15 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 13x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
產(chǎn)品目錄頁面: 657 (CN2011-ZH PDF)
配用: AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
2011 Microchip Technology Inc.
DS39931D-page 111
PIC18F46J50 FAMILY
7.5.2
FLASH PROGRAM MEMORY WRITE
SEQUENCE (WORD
PROGRAMMING)
The PIC18F46J50 family of devices has a feature that
allows programming a single word (two bytes). This
feature is enabled when the WPROG bit is set. If the
memory location is already erased, the following
sequence is required to enable this feature:
1.
Load the Table Pointer register with the address
of the data to be written. (It must be an even
address.)
2.
Write the 2 bytes into the holding registers by
performing table writes. (Do not post-increment
on the second table write.)
3.
Set the WREN bit (EECON1<2>) to enable
writes and the WPROG bit (EECON1<5>) to
select Word Write mode.
4.
Disable interrupts.
5.
Write 0x55 to EECON2.
6.
Write 0xAA to EECON2.
7.
Set the WR bit; this will begin the write cycle.
8.
The CPU will stall for the duration of the write for
TIW (see Parameter D133A).
9.
Re-enable interrupts.
EXAMPLE 7-4:
SINGLE-WORD WRITE TO FLASH PROGRAM MEMORY
MOVLW
CODE_ADDR_UPPER
; Load TBLPTR with the base address
MOVWF
TBLPTRU
MOVLW
CODE_ADDR_HIGH
MOVWF
TBLPTRH
MOVLW
CODE_ADDR_LOW
; The table pointer must be loaded with an even
address
MOVWF
TBLPTRL
MOVLW
DATA0
; LSB of word to be written
MOVWF
TABLAT
TBLWT*+
MOVLW
DATA1
; MSB of word to be written
MOVWF
TABLAT
TBLWT*
; The last table write must not increment the table
pointer! The table pointer needs to point to the
MSB before starting the write operation.
PROGRAM_MEMORY
BSF
EECON1, WPROG
; enable single word write
BSF
EECON1, WREN
; enable write to memory
BCF
INTCON, GIE
; disable interrupts
MOVLW
0x55
Required
MOVWF
EECON2
; write 0x55
Sequence
MOVLW
0xAA
MOVWF
EECON2
; write 0xAA
BSF
EECON1, WR
; start program (CPU stall)
BSF
INTCON, GIE
; re-enable interrupts
BCF
EECON1, WPROG
; disable single word write
BCF
EECON1, WREN
; disable write to memory
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