參數(shù)資料
型號(hào)： PIC10F202T-I/PG
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 4 MHz, RISC MICROCONTROLLER, PDIP8
封裝： 0.300 INCH, LEAD FREE, PLASTIC, MS-001, DIP-8
文件頁(yè)數(shù)： 18/88頁(yè)
文件大?。?/td> 1127K
代理商： PIC10F202T-I/PG
2004 Microchip Technology Inc.
Preliminary
DS41239A-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
0x10
;initialize pointer
MOVWF
FSR
;to RAM
NEXT
CLRF
INDF
;clear INDF
;register
INCF
FSR,F
;inc pointer
BTFSC
FSR,4
;all done?
GOTO
NEXT
;NO, clear next
CONTINUE
:
;YES, continue
:
Note 1:
For register map detail, see Section 4.3 “Data Memory Organization”.
Location Select
Indirect Addressing
Direct Addressing
Data
Memory(1)
0Fh
10h
Bank 0
0
4
(FSR)
00h
1Fh
(opcode)
0
4
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