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PIC16F720-E/ML Datasheet(PDF) 25 Page - Microchip Technology

No. de pieza PIC16F720-E/ML
Descripción Electrónicos  20-Pin Flash Microcontrollers with nanoWatt XLP Technology
PDF  244 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F720-E/ML Datasheet(HTML) 25 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS41430A-page 25
PIC16F/LF720/721
2.5
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 register and the IRP bit of
the STATUS register, as shown in Figure 2-6.
A simple program to clear RAM location 020h-02Fh
using indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
INDIRECT ADDRESSING
FIGURE 2-6:
DIRECT/INDIRECT ADDRESSING
MOVLW020h
;initialize pointer
MOVWFFSR
;to RAM
BANKISEL020h
NEXTCLRFINDF
;clear INDF register
INCFFSR
;inc pointer
BTFSSFSR,4 ;all done?
GOTONEXT
;no clear next
CONTINUE
;yes continue
Note:
For memory map detail, refer to Figures 2-3 and 2-4.
Data
Memory
Indirect Addressing
Direct Addressing
Bank Select
Location Select
RP1
RP0
6
0
From Opcode
IRP
File Select Register
7
0
Bank Select
Location Select
00
01
10
11
180h
1FFh
00h
7Fh
Bank 0
Bank 1
Bank 2
Bank 3



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