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PIC16C925-S/CL датащи(PDF) 28 Page - Microchip Technology

номер детали PIC16C925-S/CL
подробное описание детали  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C925-S/CL датащи(HTML) 28 Page - Microchip Technology

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PIC16C925/926
DS39544A-page 26
Preliminary
 2001 Microchip Technology Inc.
2.6
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 produce 00h. Writing to the INDF regis-
ter 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 locations 20h-2Fh
using indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
INDIRECT ADDRESSING
FIGURE 2-6:
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: For memory map detail, see Figure 2-3.
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
00h
7Fh
00h
7Fh
Bank 0
Bank 1
Bank 2
Bank 3



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