PIC16CR54C
All instructions are executed within one single
instruction cycle, unless a conditional test is true or the
8.0
INSTRUCTION SET SUMMARY
Each PIC16CR54C 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 PIC16CR54C instruction set summary
in Table 8-2 groups the instructions into byte-oriented,
bit-oriented, and literal and control operations. Table 8-1
shows the opcode field descriptions.
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.
For byte-oriented instructions, 'f' represents a file register
designator and 'd' represents a destination designator.The
file register designator is used to specify which one of the
32 file registers is to be used by the instruction.
Figure 8-1 shows the three general formats that the
instructions can have. All examples in the figure use the
following format to represent a hexadecimal number:
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.
0xhhh
where 'h' signifies a hexadecimal digit.
FIGURE 8-1: GENERAL FORMAT FOR
INSTRUCTIONS
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.
Byte-oriented file register operations
11
6
5
4
0
OPCODE
d
f (FILE #)
For literal and control operations, 'k' represents an
8 or 9-bit constant or literal value.
d = 0 for destination W
d = 1 for destination f
f = 5-bit file register address
Bit-oriented file register operations
11 8 7
b (BIT #)
TABLE 8-1:
OPCODE FIELD
DESCRIPTIONS
5
4
0
Field
Description
OPCODE
f (FILE #)
f
W
b
k
Register file address (0x00 to 0x7F)
Working register (accumulator)
b = 3-bit bit address
f = 5-bit file register address
Bit address within an 8-bit file register
Literal field, constant data or label
Literal and control operations (except GOTO)
11
Don't care location (= 0 or 1)
8
7
0
The assembler will generate code with x = 0. It is
the recommended form of use for compatibility
with all Microchip software tools.
x
d
OPCODE
k (literal)
k = 8-bit immediate value
Literal and control operations - GOTOinstruction
11 0
Destination select;
d = 0 (store result in W)
d = 1 (store result in file register 'f')
Default is d = 1
9
8
OPCODE
k (literal)
label Label name
TOS
PC
Top of Stack
k = 9-bit immediate value
Program Counter
Watchdog Timer Counter
Time-Out bit
WDT
TO
PD
Power-Down bit
Destination, either the W register or the specified
register file location
dest
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Register bit field
In the set of
italics
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1998 Microchip Technology Inc.
Preliminary
DS40191A-page 37
MICROCHIP [ MICROCHIP ]
