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18F8680 bảng dữ liệu(PDF) 89 Page - Microchip Technology

tên linh kiện 18F8680
Giải thích chi tiết về linh kiện  64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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18F8680 bảng dữ liệu(HTML) 89 Page - Microchip Technology

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 2004 Microchip Technology Inc.
DS30491C-page 87
PIC18F6585/8585/6680/8680
5.3
Reading the Flash Program
Memory
The TBLRD instruction is used to retrieve data from
program memory and places 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 TBLRD 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 5-4
shows the interface between the internal program
memory and the TABLAT.
FIGURE 5-4:
READS FROM FLASH PROGRAM MEMORY
EXAMPLE 5-1:
READING A FLASH PROGRAM MEMORY WORD
(Even Byte Address)
Program Memory
(Odd Byte Address)
TBLRD
TABLAT
TBLPTR = xxxxx1
FETCH
Instruction Register
(IR)
Read Register
TBLPTR = xxxxx0
MOVLW
upper(CODE_ADDR)
; Load TBLPTR with the base
MOVWF
TBLPTRU
; address of the word
MOVLW
high(CODE_ADDR)
MOVWF
TBLPTRH
MOVLW
low(CODE_ADDR_LOW)
MOVWF
TBLPTRL
READ_WORD
TBLRD*+
; read into TABLAT and increment
MOVF
TABLAT, W
; get data
MOVWF
LSB
TBLRD*+
; read into TABLAT and increment
MOVF
TABLAT, W
; get data
MOVWF
MSB



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