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| 型號(hào)： | PIC12F510_07 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8/14-Pin, 8-Bit Flash Microcontroller |
| 中文描述： | 8/14-Pin，8位閃存微控制器 |
| 文件頁(yè)數(shù)： | 26/116頁(yè) |
| 文件大?。?/td> | 907K |
| 代理商： | PIC12F510_07 |
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PIC12F510/16F506
DS41268C-page 24
Preliminary
2007 Microchip Technology Inc.
4.8
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.
4.8.1
INDIRECT ADDRESSING EXAMPLE
Register file 07 contains the value 10h
Register file 08 contains the value 0Ah
Load the value 07 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 = 08)
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 4-5:
DIRECT/INDIRECT ADDRESSING (PIC12F510)
PIC16F506
– Uses FSR<6:5>. Selects from Bank 0 to
Bank 3. FSR<7> is unimplemented, read as ‘
1
’.
PIC12F510
– Uses FSR<5>. Selects from Bank 0 to
Bank 1. FSR<7:6> are unimplemented, read as ‘
11
’.
MOVLW
MOVWF
CLRF
INCF
BTFSC
GOTO
0x10
FSR
INDF
FSR,F
FSR,4
NEXT
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done
;NO, clear next
NEXT
CONTINUE
:
:
;YES, continue
Note 1:
For register map detail, see Figure 4-2.
bank
select
location select
location select
bank select
Indirect Addressing
(FSR)
Direct Addressing
Data
Memory
(1)
0Fh
10h
Bank 0
Bank 1
0
4
5
6
00
01
00h
1Fh
3Fh
(opcode)
0
4
5
6
(FSR)
Addresses map back to
addresses in Bank 0.
3
2
1
3
2
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC12F510-E/L | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-Pin, 8-Bit Flash Microcontroller |
| PIC12F510-E/LQTP | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-Pin, 8-Bit Flash Microcontroller |
| PIC12F510-E/LSQTP | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-Pin, 8-Bit Flash Microcontroller |
| PIC12F510E/MC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-Pin, 8-Bit Flash Microcontrollers |
| PIC12F510-E/MC | 功能描述:8位微控制器 -MCU 1.5 KB Flash 38 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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