參數(shù)資料
型號: PIC10F200_07
廠商: Microchip Technology Inc.
英文描述: 6-Pin, 8-Bit Flash Microcontrollers
中文描述: 6引腳,8位閃存微控制器
文件頁數(shù): 25/96頁
文件大小: 946K
代理商: PIC10F200_07
2007 Microchip Technology Inc.
DS41239D-page 23
PIC10F200/202/204/206
4.9
Indirect Data Addressing: INDF
and FSR Registers
The INDF register is not a physical register. Addressing
INDF actually addresses the register whose address is
contained in the FSR register (FSR is a
pointer
). This is
indirect addressing.
4.10
Indirect Addressing
Register file 09 contains the value 10h
Register file 0A contains the value 0Ah
Load the value 09 into the FSR register
A read of the INDF register will return the value
of 10h
Increment the value of the FSR register by one
(FSR = 0A)
A read of the INDR register now will return the
value of 0Ah.
Reading INDF itself indirectly (FSR =
0
) will produce
00h. Writing to the INDF register indirectly results in a
no operation (although Status bits may be affected).
A simple program to clear RAM locations 10h-1Fh
using indirect addressing is shown in Example 4-1.
EXAMPLE 4-1:
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
The FSR is a 5-bit wide register. It is used in conjunc-
tion with the INDF register to indirectly address the data
memory area.
The FSR<4:0> bits are used to select data memory
addresses 00h to 1Fh.
FIGURE 4-6:
DIRECT/INDIRECT ADDRESSING (PIC10F200/202/204/206)
Note:
PIC10F200/202/204/206 – Do not use
banking. FSR <7:5> are unimplemented
and read as ‘
1
’s.
MOVLW
MOVWF
CLRF
0x10
FSR
INDF
;initialize pointer
;to RAM
;clear INDF
;register
;inc pointer
;all done
;NO, clear next
NEXT
INCF
BTFSC
GOTO
FSR,F
FSR,4
NEXT
CONTINUE
:
:
;YES, continue
Note 1:
For register map detail, see
Section 4.3 “Data Memory Organization”
.
Location Select
Location Select
Indirect Addressing
4
(FSR)
Direct Addressing
Data
Memory
(1)
0Fh
10h
Bank 0
0
00h
1Fh
(opcode)
0
4
相關PDF資料
PDF描述
PIC10F202T 6-Pin, 8-Bit Flash Microcontrollers
PIC10F200 6-Pin, 8-Bit Flash Microcontrollers
PIC10F200T 6-Pin, 8-Bit Flash Microcontrollers
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