PIC16F1507-ESLASHSS. datasheet(15/278 Pages) MICROCHIP

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DS40001586D-page 15

PIC16(L)F1507

3.2.1.2

Indirect Read with FSR

The program memory can be accessed as data by set-

ting bit 7 of the FSRxH register and reading the match-

ing INDFx register. The MOVIW instruction will place the

lower eight bits of the addressed word in the W register.

Writes to the program memory cannot be performed via

the INDF registers. Instructions that access the pro-

gram memory via the FSR require one extra instruction

cycle to complete. Example 3-2 demonstrates access-

ing the program memory via an FSR.

The HIGH operator will set bit<7> if a label points to a

location in program memory.

EXAMPLE 3-2:

ACCESSING PROGRAM

MEMORY VIA FSR

constants

DW DATA0

;First constant

DW DATA1

;Second constant

DW DATA2

DW DATA3

my_function

;… LOTS OF CODE…

MOVLW

DATA_INDEX

ADDLW

LOW constants

MOVWF

FSR1L

MOVLW

HIGH constants;MSb sets

automatically

MOVWF

FSR1H

BTFSC

STATUS, C

;carry from ADDLW?

INCF

FSR1h, f

;yes

MOVIW

0[FSR1]

;THE PROGRAM MEMORY IS IN W

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