參數(shù)資料
型號: ENC424J600-I/PT
廠商: Microchip Technology
文件頁數(shù): 144/168頁
文件大?。?/td> 0K
描述: IC ETHERNET CTRLR W/SPI 44-TQFP
視頻文件: Fast 100 Mbps Ethernet PICtail Plus Overview
標準包裝: 160
控制器類型: 以太網(wǎng)控制器(IEEE 802.3)
接口: SPI
電源電壓: 3 V ~ 3.6 V
電流 - 電源: 96mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 44-TQFP
供應商設備封裝: 44-TQFP(10x10)
包裝: 托盤
產品目錄頁面: 684 (CN2011-ZH PDF)
配用: AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
2007 Microchip Technology Inc.
DS39599G-page 75
PIC18F2220/2320/4220/4320
6.3
Reading the Flash Program
Memory
The TBLRD instruction is used to retrieve data from
program memory and place it into data RAM. Table
reads from program memory are performed one byte at
a time.
TBLPTR points to a byte address in program space.
Executing a TBLRD instruction places the byte pointed
to into TABLAT. In addition, TBLPTR can be modified
automatically for the next table read operation.
The internal program memory is typically organized by
words. The Least Significant bit of the address selects
between the high and low bytes of the word. Figure 6-4
shows the interface between the internal program
memory and the TABLAT.
FIGURE 6-4:
READS FROM FLASH PROGRAM MEMORY
EXAMPLE 6-1:
READING A FLASH PROGRAM MEMORY WORD
Odd (High) Byte
Program Memory
Even (Low) Byte
TABLAT
TBLPTR
Instruction Register
(IR)
Read Register
LSB = 1
TBLPTR
LSB = 0
MOVLW
CODE_ADDR_UPPER
; Load TBLPTR with the base
MOVWF
TBLPTRU
; address of the word
MOVLW
CODE_ADDR_HIGH
MOVWF
TBLPTRH
MOVLW
CODE_ADDR_LOW
MOVWF
TBLPTRL
READ_WORD
TBLRD*+
; read into TABLAT and increment TBLPTR
MOVFW
TABLAT
; get data
MOVWF
WORD_EVEN
TBLRD*+
; read into TABLAT and increment TBLPTR
MOVFW
TABLAT
; get data
MOVWF
WORD_ODD
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