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PIC17C4X

DS30412C-page 108

1996 Microchip Technology Inc.

Table 15-2 lists the instructions recognized by the

MPASM assembler.

All instruction examples use the following format to rep-

resent a hexadecimal number:

0xhh

where h signies a hexadecimal digit.

To represent a binary number:

0000 0100b

where b signies a binary string.

FIGURE 15-1: GENERAL FORMAT FOR

INSTRUCTIONS

Note 1: Any unused opcode is Reserved. Use of

any reserved opcode may cause unex-

pected operation.

Note 2: The shaded instructions are not available

in the PIC17C42

Byte-oriented le register operations

d = 0 for destination WREG

OPCODE

f (FILE #)

d = 1 for destination f

f = 8-bit le register address

Bit-oriented le register operations

11 10

8 7

OPCODE

b (BIT #)

f (FILE #)

b = 3-bit address

f = 8-bit le register address

Literal and control operations

OPCODE

k (literal)

k = 8-bit immediate value

Byte to Byte move operations

13 12

8 7

OPCODE

p (FILE #)

f (FILE #)

Call and GOTO operations

13 12

OPCODE

k (literal)

k = 13-bit immediate value

p = peripheral register le address

f = 8-bit le register address

15.1

Special Function Registers as

Source/Destination

The PIC17C4X’s orthogonal instruction set allows read

and write of all le registers, including special function

registers. There are some special situations the user

should be aware of:

15.1.1

ALUSTA AS DESTINATION

If an instruction writes to ALUSTA, the Z, C, DC and OV

bits may be set or cleared as a result of the instruction

and overwrite the original data bits written. For exam-

ple, executing CLRF

ALUSTA

will clear register

ALUSTA, and then set the Z bit leaving 0000 0100b in

the register.

15.1.2

PCL AS SOURCE OR DESTINATION

Read, write or read-modify-write on PCL may have the

following results:

Read PC:

PCH

→ PCLATH; PCL → dest

Write PCL:

PCLATH

→ PCH;

8-bit destination value

→ PCL

Read-Modify-Write:

PCL

→ ALU operand

PCLATH

→ PCH;

8-bit result

→ PCL

Where PCH = program counter high byte (not an

addressable register), PCLATH = Program counter

high holding latch, dest = destination, WREG or f.

15.1.3

BIT MANIPULATION

All bit manipulation instructions are done by rst read-

ing the entire register, operating on the selected bit and

writing the result back (read-modify-write). The user

should keep this in mind when operating on special

function registers, such as ports.

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