PIC16F88

Manufacturer Part NumberPIC16F88
ManufacturerMicrochip Technology Inc.
PIC16F88 datasheet
 
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Page 28/228:

Indirect Addressing, INDF and FSR Registers

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PIC16F87/88
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 reg-
ister. Any instruction using the INDF register actually
accesses the register pointed to by the File Select Reg-
ister, 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.
FIGURE 2-5:
DIRECT/INDIRECT ADDRESSING
Direct Addressing
From Opcode
RP1:RP0
6
Bank Select
Location Select
00h
Data
(1)
Memory
7Fh
Bank 0
Note 1:
For register file map detail, see Figure 2-2 or Figure 2-3.
DS30487C-page 26
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
MOVLW 0x20
MOVWF FSR
NEXT
CLRF
INCF
BTFSS FSR, 4 ;all done?
GOTO
CONTINUE
:
0
IRP
Bank Select
00
01
10
11
80h
100h
180h
FFh
17Fh
1FFh
Bank 1
Bank 2
Bank 3
INDIRECT ADDRESSING
;initialize pointer
;to RAM
INDF
;clear INDF register
FSR, F ;inc pointer
NEXT
;no clear next
;yes continue
Indirect Addressing
7
0
FSR Register
Location Select
 2005 Microchip Technology Inc.