P12C508 datasheet(45/84 Pages) MICROCHIP

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Advance Information

DS40139A-page 45

PIC12C5XX

OPTION

Load OPTION Register

Syntax:

[

label ]

OPTION

Operands:

None

Operation:

(W)

→ OPTION

Status Affected:

None

Encoding:

0000

0010

Description:

The content of the W register is loaded

into the OPTION register.

Words:

Cycles:

Example

OPTION

Before Instruction

0x07

After Instruction

OPTION =

0x07

RETLW

Return with Literal in W

Syntax:

[

label ]

RETLW k

Operands:

≤ k ≤ 255

Operation:

→ (W);

TOS

→ PC

Status Affected:

None

Encoding:

1000

kkkk

Description:

The W register is loaded with the eight

bit literal 'k'. The program counter is

loaded from the top of the stack (the

return address). This is a two cycle

instruction.

Words:

Cycles:

Example:

TABLE

CALL TABLE ;W contains

;table offset

;value.

•

;W now has table

•

;value.

•

ADDWF PC

;W = offset

RETLW k1

;Begin table

RETLW k2

;

•

RETLW kn

; End of table

Before Instruction

0x07

After Instruction

value of k8

RLF

Rotate Left f through Carry

Syntax:

[

label ] RLF

f,d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

See description below

Status Affected:

Encoding:

0011

01df

ffff

Description:

The contents of register 'f' are rotated

one bit to the left through the Carry

Flag. If 'd' is 0 the result is placed in the

W register. If 'd' is 1 the result is stored

back in register 'f'.

Words:

Cycles:

Example:

RLF

REG1,0

Before Instruction

REG1

1110 0110

After Instruction

REG1

1110 0110

1100 1100

RRF

Rotate Right f through Carry

Syntax:

[

label ]

RRF f,d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

See description below

Status Affected:

Encoding:

0011

00df

ffff

Description:

The contents of register 'f' are rotated

one bit to the right through the Carry

Flag. If 'd' is 0 the result is placed in the

W register. If 'd' is 1 the result is placed

back in register 'f'.

Words:

Cycles:

Example:

RRF

REG1,0

Before Instruction

REG1

1110 0110

After Instruction

REG1

1110 0110

0111 0011

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