RFPIC12C509AG Datasheet, PDF (59/104 Pages) Microchip Technology – 18/20-Pin 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12C509AG/509AF
9.0 INSTRUCTION SET SUMMARY
Each rfPIC12C509AG/509AF instruction is a 12-bit
word divided into an OPCODE, which specifies the
instruction type, and one or more operands which fur-
ther specify the operation of the instruction. The
rfPIC12C509AG/509AF instruction set summary in
Table 9-2 groups the instructions into byte-oriented, bit-
oriented, and literal and control operations. Table 9-1
shows the opcode field descriptions.
For byte-oriented instructions, 'f' represents a file reg-
ister designator and 'd' represents a destination desig-
nator. The file register designator is used to specify
which one of the 32 file registers 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: OPCODE FIELD
DESCRIPTIONS
Field
f
W
b
k
x
d
label
TOS
PC
WDT
TO
PD
dest
[]
()
→
<>
∈
italics
Description
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)
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 num-
ber:
0xhhh
where 'h' signifies a hexadecimal digit.
FIGURE 9-1:
GENERAL FORMAT FOR
INSTRUCTIONS
Byte-oriented file register operations
11
654
0
OPCODE
d
f (FILE #)
d = 0 for destination W
d = 1 for destination f
f = 5-bit file register address
Bit-oriented file register operations
11
87 5 4
0
OPCODE
b (BIT #) f (FILE #)
b = 3-bit bit address
f = 5-bit file register address
Literal and control operations (except GOTO)
11
OPCODE
87
0
k (literal)
k = 8-bit immediate value
Literal and control operations - GOTO instruction
11
OPCODE
98
0
k (literal)
k = 9-bit immediate value
© 2001 Microchip Technology Inc.
Preliminary
DS70031A-page 57