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PIC18F2525 Datasheet(PDF) 85 Page - Microchip Technology |
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PIC18F2525 Datasheet(HTML) 85 Page - Microchip Technology |
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85 / 412 page  © 2008 Microchip Technology Inc. DS39626E-page 83 PIC18F2525/2620/4525/4620 7.3 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 7-4 shows the interface between the internal program memory and the TABLAT. FIGURE 7-4: READS FROM FLASH PROGRAM MEMORY EXAMPLE 7-1: 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 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 MOVF TABLAT, W ; get data MOVWF WORD_EVEN TBLRD*+ ; read into TABLAT and increment MOVF TABLAT, W ; get data MOVWF WORD_ODD |
Similar Part No. - PIC18F2525_08 |
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Similar Description - PIC18F2525_08 |
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