PIC16F747 Microchip Technology Inc., PIC16F747 Datasheet - Page 32
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PIC16F747
Manufacturer Part Number
PIC16F747
Description
28/40/44-pin, 8-bit Cmos Flash Microcontrollers With 10-bit A/d And Nanowatt Technology
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F747.pdf
(276 pages)
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PIC16F7X7
2.5
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.
FIGURE 2-5:
DS30498C-page 30
Note 1:
Bank Select
RP1:RP0
Indirect Addressing, INDF and
FSR Registers
For register file map detail, see Figure 2-2.
Direct Addressing
Location Select
6
Data
Memory
DIRECT/INDIRECT ADDRESSING
From Opcode
(1)
00h
7Fh
Bank 0
00
0
80h
FFh
Bank 1
01
100h
17Fh
Bank 2
10
EXAMPLE 2-2:
NEXT
CONTINUE
180h
1FFh
:
Bank 3
11
MOVLW
MOVWF
CLRF
INCF
BTFSS
GOTO
IRP
Bank Select
0x20
FSR
INDF
FSR, F ;inc pointer
FSR, 4 ;all done?
NEXT
7
INDIRECT ADDRESSING
Indirect Addressing
2004 Microchip Technology Inc.
;initialize pointer
;to RAM
;clear INDF register
;no clear next
;yes continue
FSR Register
Location Select
0
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