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PIC12F635E/P bảng dữ liệu(PDF) 29 Page - Microchip Technology

tên linh kiện PIC12F635E/P
Giải thích chi tiết về linh kiện  8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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PIC12F635E/P bảng dữ liệu(HTML) 29 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
Preliminary
DS41232B-page 27
PIC12F635/PIC16F636/639
2.4
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 Status bits may be
affected). An effective 9-bit address is obtained by
concatenating
the
8-bit
FSR
and
the
IRP
bit
(STATUS<7>), as shown in Figure 2-6.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 2-1.
EXAMPLE 2-1:
INDIRECT ADDRESSING
FIGURE 2-6:
DIRECT/INDIRECT ADDRESSING PIC12F635/PIC16F636/639
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
CONTINUE
;yes continue
Note: For memory map detail, see Figure 2-2.
Data
Memory
Indirect Addressing
Direct Addressing
Bank Select
Location Select
RP1 RP0
6
0
From Opcode
IRP
File Select 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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