收藏本站
参数资料
型号： PIC18LF96J65-I/PT
厂商： Microchip Technology
文件页数： 130/131页
文件大小： 0K
描述： IC PIC MCU FLASH 48KX16 100TQFP
标准包装： 90
系列： PIC® 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 41.667MHz
连通性： EBI/EMI，以太网，I²C，SPI，UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 70
程序存储器容量： 96KB（48K x 16）
程序存储器类型： 闪存
RAM 容量： 3808 x 8
电压 - 电源 (Vcc/Vdd)： 2 V ~ 3.6 V
数据转换器： A/D 16x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 100-TQFP
包装： 托盘
PIC18F97J60 FAMILY
DS39762F-page 98
2011 Microchip Technology Inc.
6.4
Data Addressing Modes
While the program memory can be addressed in only
one way, through the program counter, information in
the data memory space can be addressed in several
ways. For most instructions, the addressing mode is
fixed. Other instructions may use up to three modes,
depending on which operands are used and whether or
not the extended instruction set is enabled.
The addressing modes are:
Inherent
Literal
Direct
Indirect
An additional addressing mode, Indexed Literal Offset,
is available when the extended instruction set is
enabled (XINST Configuration bit = 1). Its operation is
discussed in greater detail in Section 6.6.1 “Indexed
Addressing with Literal Offset”
.
6.4.1
INHERENT AND LITERAL
ADDRESSING
Many PIC18 control instructions do not need any
argument at all. They either perform an operation that
globally affects the device, or they operate implicitly on
one register. This addressing mode is known as Inherent
Addressing. Examples include SLEEP, RESET and DAW.
Other instructions work in a similar way, but require an
additional explicit argument in the opcode. This is
known as Literal Addressing mode because they
require some literal value as an argument. Examples
include ADDLW and MOVLW, which respectively, add or
move a literal value to the W register. Other examples
include CALL and GOTO, which include a 20-bit
program memory address.
6.4.2
DIRECT ADDRESSING
Direct Addressing mode specifies all or part of the
source and/or destination address of the operation
within the opcode itself. The options are specified by
the arguments accompanying the instruction.
In the core PIC18 instruction set, bit-oriented and
byte-oriented instructions use some version of Direct
Addressing by default. All of these instructions include
some 8-bit literal address as their Least Significant
Byte. This address specifies either a register address in
one of the banks of data RAM (Section 6.3.3 “General
Purpose Register File”
) or a location in the Access
Bank (Section 6.3.2 “Access Bank”) as the data
source for the instruction.
The Access RAM bit, ‘a’, determines how the address
is interpreted. When ‘a’ is ‘1’, the contents of the BSR
(Section 6.3.1 “Bank Select Register”) are used with
the address to determine the complete 12-bit address
of the register. When ‘a’ is ‘0’, the address is interpreted
as being a register in the Access Bank. Addressing that
uses the Access RAM is sometimes also known as
Direct Forced Addressing mode.
A few instructions, such as MOVFF, include the entire
12-bit address (either source or destination) in their
opcodes. In these cases, the BSR is ignored entirely.
The destination of the operation’s results is determined
by the destination bit, ‘d’. When ‘d’ is ‘1’, the results are
stored back in the source register, overwriting its origi-
nal contents. When ‘d’ is ‘0’, the results are stored in
the W register. Instructions without the ‘d’ argument
have a destination that is implicit in the instruction.
Their destination is either the target register being
operated on or the W register.
6.4.3
INDIRECT ADDRESSING
Indirect Addressing mode allows the user to access a
location in data memory without giving a fixed address
in the instruction. This is done by using File Select
Registers (FSRs) as pointers to the locations to be read
or written to. Since the FSRs are themselves located in
RAM as Special Function Registers, they can also be
directly manipulated under program control. This
makes FSRs very useful in implementing data
structures, such as tables and arrays in data memory.
The registers for Indirect Addressing are also
implemented with Indirect File Operands (INDFs) that
permit automatic manipulation of the pointer value with
auto-incrementing, auto-decrementing or offsetting
with another value. This allows for efficient code using
loops, such as the example of clearing an entire RAM
bank in Example 6-5. It also enables users to perform
Indexed
Addressing
and
other
Stack
Pointer
operations for program memory in data memory.
EXAMPLE 6-5:
HOW TO CLEAR RAM
(BANK 1) USING INDIRECT
ADDRESSING
Note:
The execution of some instructions in the
core PIC18 instruction set are changed
when the PIC18 extended instruction set is
enabled. See Section 6.6 “Data Memory
and the Extended Instruction Set”
for
more information.
LFSRFSR0, 100h;
NEXT
CLRFPOSTINC0; Clear INDF
; register then
; inc pointer
BTFSSFSR0H, 1; All done with
; Bank1?
BRA NEXT
; NO, clear next
CONTINUE
; YES, continue
相关PDF资料
PDF描述
PIC24F16KL401-I/P IC MCU 16BIT 16KB FLASH 20-PDIP
PIC24FJ128GA010-I/PF IC PIC MCU FLASH 128KB 100TQFP
PIC24FJ256GA110-I/PF IC PIC MCU FLASH 256K 100TQFP
PIC24FJ256GB110-I/PF IC PIC MCU FLASH 256K 100TQFP
PIC24FJ64GA004-E/ML IC PIC MCU FLASH 64K 44-QFN
相关代理商/技术参数
参数描述
PIC1-R68-JT 制造商:RCD 制造商全称:RCD COMPONENTS INC. 功能描述:SURFACE MOUNT POWER INDUCTORS
PIC1-R68-JTQ 制造商:RCD 制造商全称:RCD COMPONENTS INC. 功能描述:SURFACE MOUNT POWER INDUCTORS
PIC1-R68-JTW 制造商:RCD 制造商全称:RCD COMPONENTS INC. 功能描述:SURFACE MOUNT POWER INDUCTORS
PIC1-R68-KT 制造商:RCD 制造商全称:RCD COMPONENTS INC. 功能描述:SURFACE MOUNT POWER INDUCTORS
PIC1-R68-KTQ 制造商:RCD 制造商全称:RCD COMPONENTS INC. 功能描述:SURFACE MOUNT POWER INDUCTORS
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*