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PIC16F7X7 Datasheet(PDF) 32 Page - Microchip Technology

Part # PIC16F7X7
Description  28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  276 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F7X7 Datasheet(HTML) 32 Page - Microchip Technology

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PIC16F7X7
DS30498C-page 30
 2004 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 the register pointed to by the File
Select Register, FSR. Reading the INDF register itself
indirectly (FSR = 0) will read 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 2-5.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
INDIRECT ADDRESSING
FIGURE 2-5:
DIRECT/INDIRECT ADDRESSING
MOVLW
0x20
;initialize pointer
MOVWF
FSR
;to RAM
NEXT
CLRF
INDF
;clear INDF register
INCF
FSR, F
;inc pointer
BTFSS
FSR, 4
;all done?
GOTO
NEXT
;no clear next
CONTINUE
:
;yes continue
Note
1:
For register file map detail, see Figure 2-2.
Data
Memory(1)
Indirect Addressing
Direct Addressing
Bank Select
Location Select
RP1:RP0
6
0
From Opcode
IRP
FSR Register
7
0
Bank Select
Location Select
00
01
10
11
Bank 0
Bank 1
Bank 2
Bank 3
FFh
80h
7Fh
00h
17Fh
100h
1FFh
180h



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