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PIC16F917E/ML301 Datasheet(PDF) 32 Page - Microchip Technology

Part # PIC16F917E/ML301
Description  28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology
PDF  272 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F917E/ML301 Datasheet(HTML) 32 Page - Microchip Technology

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PIC16F917/916/914/913
DS41250E-page 30
Preliminary
© 2005 Microchip Technology Inc.
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
(STATUS<7>), as shown in Figure 2-6.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
INDIRECT ADDRESSING
FIGURE 2-6:
DIRECT/INDIRECT ADDRESSING PIC16F917/916/914/913
MOVLW
0x20
;initialize pointer
MOVWF
FSR
;to RAM
NEXTCLRF
INDF
;clear INDF register
INCF
FSR
;inc pointer
BTFSS
FSR,4
;all done?
GOTO
NEXT
;no clear next
CONTINUE
;yes continue
Note:
For memory map detail, see 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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