PIC16HV540 Datasheet, PDF (8/36 Pages) Microchip Technology – Enhanced PIC16C54 EPROM-Based 8-Bit CMOS Microcontroller With On-Chip Voltage Regulator

PIC16HV540
5.0 INSTRUCTION SET SUMMARY
Each PIC16HV540 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 PIC16HV540 instruction set summary
in Table 5-2 groups the instructions into byte-oriented,
bit-oriented, and literal and control operations. Table 5-1
shows the opcode field descriptions.
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.
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 5-1: 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 one 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 5-1 shows the three general formats that the
instructions can have. All examples in the figure use the
following format to represent a hexadecimal number:
0xhhh
where 'h' signifies a hexadecimal digit.
FIGURE 5-1: 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
DS40197A-page 8
Preliminary
© 1998 Microchip Technology Inc.