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| 型號(hào)： | PIC18F67J60 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 64/80/100-Pin, High-Performance, 1 Mbit Flash Microcontrollers with Ethernet |
| 中文描述： | 64/80/100-Pin，高性能，1兆位閃存微控制器與以太網(wǎng) |
| 文件頁(yè)數(shù)： | 90/474頁(yè) |
| 文件大?。?/td> | 3834K |
| 代理商： | PIC18F67J60 |
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PIC18F97J60 FAMILY
DS39762A-page 88
Advance Information
2006 Microchip Technology Inc.
5.4
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 5.6.1 “Indexed
Addressing with Literal Offset”
.
5.4.1
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.
5.4.2
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 5.3.3 “General
Purpose Register File”
), or a location in the Access
Bank (
Section 5.3.2 “Access Bank”
) as the data
source for the instruction.
The Access RAM bit ‘a(chǎn)’ determines how the address is
interpreted. When ‘a(chǎn)’ is ‘
1
’, the contents of the BSR
(
Section 5.3.1 “Bank Select Register”
) are used with
the address to determine the complete 12-bit address
of the register. When ‘a(chǎn)’ 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.
5.4.3
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 5-5. It also enables users to perform
indexed addressing and other Stack Pointer operations
for program memory in data memory.
EXAMPLE 5-5:
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 5.6 “Data Memory
and the Extended Instruction Set”
for
more information.
LFSR
CLRF
FSR0, 100h
POSTINC0
;
; Clear INDF
; register then
; inc pointer
; All done with
; Bank1
; NO, clear next
; YES, continue
NEXT
BTFSS FSR0H, 1
BRA
NEXT
CONTINUE
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| PIC18F67J60-I/PT | 功能描述:8位微控制器 -MCU 128KB FL 12KB RAM 10BASE-T 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 |
| PIC18F67J60T-I/PT | 功能描述:8位微控制器 -MCU 128KB FL 12KB RAM 10BASE-T 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 |
| PIC18F67J90-I/PT | 功能描述:8位微控制器 -MCU Segmnt LCD 128KBFlsh 4KBRAM 12MIPS 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 |
| PIC18F67J90T-I/PT | 功能描述:8位微控制器 -MCU Segmnt LCD 128KBFlsh 4KBRAM 12MIPS 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 |
| PIC18F67J93-I/PT | 功能描述:8位微控制器 -MCU 64pn,SEG LCD,4KB RAM 128KB Flsh,12bit ADC 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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