参数资料
型号: PIC18F45J50-I/ML
厂商: Microchip Technology
文件页数: 163/164页
文件大小: 0K
描述: IC PIC MCU FLASH 32K 2V 44-QFN
产品培训模块: XLP Deep Sleep Mode
PIC18 J Series MCU Overview
8-bit PIC® Microcontroller Portfolio
标准包装: 45
系列: PIC® XLP™ 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 48MHz
连通性: I²C,SPI,UART/USART,USB
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
RAM 容量: 3.8K x 8
电压 - 电源 (Vcc/Vdd): 2.15 V ~ 3.6 V
数据转换器: A/D 13x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-VQFN 裸露焊盘
包装: 管件
产品目录页面: 657 (CN2011-ZH PDF)
配用: AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
PIC18F46J50 FAMILY
DS39931D-page 98
2011 Microchip Technology Inc.
6.4.3.1
FSR Registers and the INDF
Operand (INDF)
At the core of Indirect Addressing are three sets of
registers: FSR0, FSR1 and FSR2. Each represents a
pair of 8-bit registers, FSRnH and FSRnL. The four
upper bits of the FSRnH register are not used, so each
FSR pair holds a 12-bit value. This represents a value
that can address the entire range of the data memory
in a linear fashion. The FSR register pairs then serve as
pointers to data memory locations.
Indirect Addressing is accomplished with a set of INDF
operands, INDF0 through INDF2. These can be pre-
sumed as “virtual” registers: they are mapped in the
SFR space but are not physically implemented. Read-
ing or writing to a particular INDF register actually
accesses its corresponding FSR register pair. A read
from INDF1, for example, reads the data at the address
indicated by FSR1H:FSR1L. Instructions that use the
INDF registers as operands actually use the contents
of their corresponding FSR as a pointer to the instruc-
tion’s target. The INDF operand is just a convenient
way of using the pointer.
Because Indirect Addressing uses a full 12-bit address,
data RAM banking is not necessary. Thus, the current
contents of the BSR and the Access RAM bit have no
effect on determining the target address.
FIGURE 6-8:
INDIRECT ADDRESSING
FSR1H:FSR1L
0
7
Data Memory
000h
100h
200h
300h
F00h
E00h
FFFh
Bank 0
Bank 1
Bank 2
Bank 14
Bank 15
Bank 3
through
Bank 13
ADDWF
, INDF1, 1
0
7
Using an instruction with one of the
Indirect Addressing registers as the
operand....
...uses the 12-bit address stored in
the FSR pair associated with that
register....
...to determine the data memory
location to be used in that operation.
In this case, the FSR1 pair contains
FCCh. This means the contents of
location FCCh will be added to that
of the W register and stored back in
FCCh.
xx xx 11 11
1 1 0 0 11 0 0
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