PIC12F519 Microchip Technology, PIC12F519 Datasheet - Page 51

• Manufacturer Part Number: PIC12F519
• Description: 8-Bit Flash Microcontroller
• Manufacturer: Microchip Technology

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9.0
The PIC12F519 instruction set is highly orthogonal and
is comprised of three basic categories.
• Byte-oriented operations
• Bit-oriented operations
• Literal and control operations
Each PIC12F519 instruction is a 12-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 formats for each of the
categories is presented in Figure 9-1, while the various
opcode fields are summarized in Table 9-1.
For byte-oriented instructions, ‘f’ represents a file reg-
ister designator and ‘d’ represents a destination desig-
nator. The file register designator specifies which file
register is to be used by the instruction.
The destination designator specifies where the result of
the operation is to be placed. If ‘d’ is ‘0’, the result is
placed in the W register. If ‘d’ is ‘1’, the result is placed
in the file register specified in the instruction.
For bit-oriented instructions, ‘b’ represents a bit field
designator which selects the number of the bit affected
by the operation, while ‘f’ represents the number of the
file in which the bit is located.
For literal and control operations, ‘k’ represents an
8 or 9-bit constant or literal value.
TABLE 9-1:
© 2007 Microchip Technology Inc.
italics
[
(
Field
WDT
label
TOS
dest
< >
PC
TO
PD
W
→
∈
b
d
k
x
f
]
)
INSTRUCTION SET SUMMARY
Register file address (0x00 to 0x7F)
Working register (accumulator)
Bit address within an 8-bit file register
Literal field, constant data or label
Don’t care location (= 0 or 1)
The assembler will generate code with x = 0. It is the
recommended form of use for compatibility with all
Microchip software tools.
Destination select;
d = 0 (store result in W)
d = 1 (store result in file register ‘f’)
Default is d = 1
Label name
Top-of-Stack
Program Counter
Watchdog Timer counter
Time-out bit
Power-down bit
Destination, either the W register or the specified
register file location
Options
Contents
Assigned to
Register bit field
In the set of
User defined term (font is courier)
OPCODE FIELD
DESCRIPTIONS
Description
Preliminary
All instructions are executed within a single instruction
cycle, unless a conditional test is true or the program
counter is changed as a result of an instruction. In this
case, the execution takes 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 μs. If a conditional test is
true or the program counter is changed as a result of an
instruction, the instruction execution time is 2 μs.
Figure 9-1 shows the three general formats that the
instructions can have. All examples in the figure use
the following format to represent a hexadecimal
number:
where ‘h’ signifies a hexadecimal digit.
FIGURE 9-1:
Byte-oriented file register operations
Bit-oriented file register operations
Literal and control operations (except GOTO)
Literal and control operations – GOTO instruction
0xhhh
11
11
11
11
d = 0 for destination W
d = 1 for destination f
f = 5-bit file register address
b = 3-bit bit address
f = 5-bit file register address
k = 8-bit immediate value
k = 9-bit immediate value
OPCODE
OPCODE
OPCODE
OPCODE
6
8 7
GENERAL FORMAT FOR
INSTRUCTIONS
b (BIT #)
d
5
9
8
PIC12F519
4
8
7
5 4
f (FILE #)
k (literal)
k (literal)
f (FILE #)
DS41319A-page 49
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