PIC16HV785-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16HV785-I/SO

20-Pin Flash-Based, 8-Bit CMOS Microcontroller with Two-Phase Asynchronous Feedback PWM Dual High-Speed Comparators and Dual Operational Amplifiers

Microchip Technology 

PIC16F785/HV785

2.4 Indirect Addressing, INDF and

FSR Registers

The INDF register is not a physical register. Addressing

the INDF register will cause indirect addressing.

Indirect addressing is possible by using the INDF

register. Any instruction using the INDF register

actually accesses data pointed to by the File Select

Register (FSR). Reading INDF itself indirectly will

produce 00h. Writing to the INDF register indirectly

results in a no operation (although Status bits may be

affected). An effective 9-bit address is obtained by

concatenating the 8-bit FSR and the IRP bit in the

STATUS Register, as shown in Figure 2-4.

A simple program to clear RAM location 20h-2Fh using

indirect addressing is shown in Example 2-1.

EXAMPLE 2-1: INDIRECT ADDRESSING

MOVLW

MOVWF

NEXT CLRF

INCF

BTFSS

GOTO

CONTINUE

0x20

FSR

INDF

FSR

FSR,4

NEXT

;initialize pointer

;to RAM

;clear INDF register

;increment pointer

;all done?

;no clear next

;yes continue

FIGURE 2-4:

DIRECT/INDIRECT ADDRESSING PIC16F785/HV785

Direct Addressing

RP1RP0 6

From Opcode 0

Indirect Addressing

IRP

7

File Select Register 0

Bank Select

Location Select

00

01

10

00H

Bank Select

11

180h

Location Select

Data

Memory

7FH

Bank 0

Bank 1 Bank 2

1FFh

Bank 3

Note: For memory map detail see Figure 2-2.

DS41249E-page 22

© 2008 Microchip Technology Inc.

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