PIC16F1503 查看數據表（PDF） - Microchip Technology

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PIC16F1503

14-Pin Flash, 8-Bit Microcontrollers

Microchip Technology 

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

PIC16(L)F1503

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DS40001607D-page 15

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