PIC18F24J11 MICROCHIP [Microchip Technology], PIC18F24J11 Datasheet - Page 413
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PIC18F24J11
Manufacturer Part Number
PIC18F24J11
Description
28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24J11.pdf
(536 pages)
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27.0
The PIC18F46J11 family of devices incorporates the
standard set of 75 PIC18 core instructions, and an
extended set of eight new instructions for the optimiza-
tion of code that is recursive or that utilizes a software
stack. The extended set is discussed later in this
section.
27.1
The standard PIC18 instruction set adds many
enhancements to the previous PIC
sets, while maintaining an easy migration from these
PIC MCU instruction sets. Most instructions are a
single program memory word (16 bits), but there are
four instructions that require two program memory
locations.
Each single-word instruction is a 16-bit word divided
into an opcode, which specifies the instruction type and
one or more operands, which further specify the
operation of the instruction.
The instruction set is highly orthogonal and is grouped
into four basic categories:
• Byte-oriented operations
• Bit-oriented operations
• Literal operations
• Control operations
The PIC18 instruction set summary in
the byte-oriented, bit-oriented, literal and control
operations.
Table 27-1
Most Byte-oriented instructions have three operands:
1.
2.
3.
The file register designator, ‘f’, specifies which file
register is to be used by the instruction. The destination
designator, ‘d’, specifies where the result of the
operation is to be placed. If ‘d’ is ‘0’, the result is placed
in the WREG register. If ‘d’ is ‘1’, the result is placed in
the file register specified in the instruction.
All Bit-oriented instructions have three operands:
1.
2.
3.
The bit field designator ‘b’ selects the number of the bit
affected by the operation, while the file register desig-
nator, ‘f’, represents the number of the file in which the
bit is located.
2011 Microchip Technology Inc.
The file register (specified by ‘f’)
The destination of the result (specified by ‘d’)
The accessed memory (specified by ‘a’)
The file register (specified by ‘f’)
The bit in the file register (specified by ‘b’)
The accessed memory (specified by ‘a’)
INSTRUCTION SET SUMMARY
Standard Instruction Set
provides the opcode field descriptions.
®
MCU instruction
Table 27-2
lists
PIC18F46J11 FAMILY
The Literal instructions may use some of the following
operands:
• A literal value to be loaded into a file register
• The desired FSR register to load the literal value
• No operand required (specified by ‘—’)
The Control instructions may use some of the
following operands:
• A program memory address (specified by ‘n’)
• The mode of the CALL or RETURN instructions
• The mode of the table read and table write
• No operand required (specified by ‘—’)
All instructions are a single word, except for four
double-word instructions. These instructions were
made double-word to contain the required information
in 32 bits. In the second word, the 4 MSbs are ‘1’s. If
this second word is executed as an instruction (by
itself), it will execute as a NOP.
All single-word instructions are executed in a single
instruction cycle, unless a conditional test is true or the
Program Counter (PC) is changed as a result of the
instruction. In these cases, the execution takes two
instruction cycles with the additional instruction
cycle(s) executed as a NOP.
The double-word instructions execute in two instruction
cycles.
One instruction cycle consists of four oscillator periods.
Thus, for an oscillator frequency of 4 MHz, the normal
instruction execution time is 1 s. If a conditional test is
true, or the program counter is changed as a result of
an instruction, the instruction execution time is 2 s.
Two-word branch instructions (if true) would take 3 s.
Figure 27-1
instructions can have. All examples use the convention
‘nnh’ to represent a hexadecimal number.
The instruction set summary, provided in
lists the standard instructions recognized by the
Microchip MPASM
Section 27.1.1 “Standard Instruction Set”
a description of each instruction.
(specified by ‘k’)
into (specified by ‘f’)
(specified by ‘s’)
instructions (specified by ‘m’)
provides the general formats that the
TM
Assembler.
DS39932D-page 413
Table
provides
27-2,
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