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參數(shù)資料
| 型號： | MCV14AT-I/SL |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14 |
| 封裝： | 3.90 MM, PLASTIC, SOIC-14 |
| 文件頁數(shù)： | 13/82頁 |
| 文件大?。?/td> | 1053K |
| 代理商： | MCV14AT-I/SL |
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MCV14A
DS41338C-page 20
Preliminary
2009 Microchip Technology Inc.
3.8
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.
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).
The FSR is 8-bit wide register. It is used in conjunction
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.
FSR<6:5> are the bank select bits and are used to
select the bank to be addressed (00 = Bank 0,
01
=Bank 1, 10 = Bank 2, 11 = Bank 3).
FSR<7> is unimplemented and read as ‘1’.
A simple program to clear RAM locations 10h-1Fh
using indirect addressing is shown in Example 3-1.
EXAMPLE 3-1:
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
FIGURE 3-4:
DIRECT/INDIRECT ADDRESSING
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 Figure 3-2.
bank
select
location select
bank select
Indirect Addressing
Direct Addressing
Data
Memory(1)
0Ch
0Dh
0
4
5
6
(FSR)
10
00
01
11
00h
0Fh
2Fh
4Fh
6Fh
(opcode)
0
4
5
6
(FSR)
Addresses map back to
addresses in Bank 0.
3
2
1
3
2
1
10h
Bank 0
Bank 1
Bank 2
Bank 3
1Fh
3Fh
5Fh
7Fh
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相關(guān)代理商/技術(shù)參數(shù) |
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| MCV15/10-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 10WAY |
| MCV15/2-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 2WAY |
| MCV15/3-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 3WAY |
| MCV15/4-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 4WAY |
| MCV15/5-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 5WAY |
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