Datasheet

PIC18F2X1X/4X1X

EXAMPLE 6-1: READING A FLASH PROGRAM MEMORY WORD

TABLE 6-2: REGISTERS ASSOCIATED WITH READING PROGRAM FLASH MEMORY

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

MOVF WORD_ODD

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Reset

Values on

Page

TBLPTRU — — bit 21 Program Memory Table Pointer Upper Byte

(TBLPTR<20:16>)

TBPLTRH Program Memory Table Pointer High Byte (TBLPTR<15:8>) 51

TBLPTRL Program Memory Table Pointer Low Byte (TBLPTR<7:0>) 51

TABLAT Program Memory Table Latch 51

Legend: — = unimplemented, read as ‘0’. Shaded cells are not used during Flash access.