PIC12F519-ESLASHMS datasheet(22/96 Pages) MICROCHIP

22 / 96 page

PIC12F519

DS41319B-page 20

4.8

Indirect Data Addressing: INDF

and FSR Registers

The INDF

is not

a physical register.

Addressing INDF actually addresses the register

whose address is contained in the FSR register (

FSR

is a pointer). This is indirect addressing.

Reading INDF itself indirectly (FSR = 0) will produce

00h. Writing to the INDF register indirectly results in a

no-operation (although Status bits may be affected).

The FSR is an 8-bit wide register. It is used in conjunc-

tion with the INDF Register to indirectly address the

data memory area.

The FSR<4:0> bits are used to select data memory

addresses 00h to 1Fh.

FSR<5> is used to select between banks (0 = Bank 0,

=Bank 1).

FSR<7:6> are unimplemented and read as ‘11’.

EXAMPLE 4-1:

HOW TO CLEAR RAM

USING INDIRECT

ADDRESSING

FIGURE 4-4:

DIRECT/INDIRECT ADDRESSING

MOVLW

0x10

;initialize pointer

MOVWF

FSR

;to RAM

CLRF

INDF

;clear INDF

;register

INCF

FSR,F

;inc pointer

BTFSC

FSR,4

;all done?

GOTO

;NO, clear next

CONTINUE

;YES, continue

Bank

Location Select

Bank Select

Indirect Addressing

Direct Addressing

Data

Memory

0Fh

10h

Bank 0

Bank 1

5(FSR)

00h

1Fh

3Fh

(opcode)

(FSR)

PIC12F519-E/MS Datasheet(PDF) 22 Page - Microchip Technology

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