PIC16HV540 Microchip Technology, PIC16HV540 Datasheet - Page 43

• Manufacturer Part Number: PIC16HV540
• Description: Enhanced PIC16C54 EPROM-Based 8-Bit CMOS Microcontroller
• Manufacturer: Microchip Technology

8.0
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 instruc-
tion 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 descrip-
tions.
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 8-1:
label
dest
Field
i
2000 Microchip Technology Inc.
talics
TOS
WDT
< >
( )
PC
TO
PD
[ ]
f
W
b
k
x
d
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 com-
patibility with all Microchip software tools.
Destination select;
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)
d = 0 (store result in W)
d = 1 (store result in file register ’f’)
OPCODE FIELD
DESCRIPTIONS
Description
Preliminary
All instructions are executed within one single instruc-
tion cycle, unless a conditional test is true or the pro-
gram 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 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.
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:
where ’h’ signifies a hexadecimal digit.
FIGURE 8-1:
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
GENERAL FORMAT FOR
INSTRUCTIONS
PIC16HV540
6
8 7
b (BIT #)
d
5
9
8
4
8
7
5 4
f (FILE #)
k (literal)
k (literal)
f (FILE #)
DS40197B-page 43
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