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PIC16F628-20/SS Datasheet(PDF) 26 Page - Microchip Technology

Part # PIC16F628-20/SS
Description  FLASH-Based 8-Bit CMOS Microcontrollers
PDF  160 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F628-20/SS Datasheet(HTML) 26 Page - Microchip Technology

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PIC16F62X
DS40300B-page 26
Preliminary
© 1999 Microchip Technology Inc.
4.4
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 sta-
tus 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 4-8.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 4-1.
EXAMPLE 4-1:
INDIRECT ADDRESSING
movlw
0x20
;initialize pointer
movwf
FSR
;to RAM
NEXT
clrf
INDF
;clear INDF register
incf
FSR
;inc pointer
btfss
FSR,4
;all done?
goto
NEXT
;no clear next
;yes continue
CONTINUE:
FIGURE 4-8:
DIRECT/INDIRECT ADDRESSING PIC16F62X
For memory map detail see Figure 4-3.
Data
Memory
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
180h
1FFh
00h
7Fh
Bank 0
Bank 1
Bank 2
Bank 3



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