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PIC18F1220E/PQTP bảng dữ liệu(PDF) 63 Page - Microchip Technology

tên linh kiện PIC18F1220E/PQTP
Giải thích chi tiết về linh kiện  18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers
PDF  308 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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PIC18F1220E/PQTP bảng dữ liệu(HTML) 63 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS39605F-page 61
PIC18F1220/1320
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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