PIC16F627A datasheet(127/180 Pages) MICROCHIP

127 / 180 page

DS40044D-page 125

PIC16F627A/628A/648A

RETLW

Return with Literal in W

Syntax:

[ label ]

RETLW k

Operands:

≤ k ≤ 255

Operation:

→ (W);

TOS

→ PC

Status Affected:

None

Encoding:

01xx

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

W = 0x07

After Instruction

W = value of k8

RETURN

Return from Subroutine

Syntax:

[ label ]

RETURN

Operands:

None

Operation:

TOS

→ PC

Status Affected:

None

Encoding:

0000

1000

Description:

Return from subroutine. The

stack is POPed and the top of

the stack (TOS) is loaded into

the program counter. This is a

two-cycle instruction.

Words:

Cycles:

Example

RETURN

After Interrupt

PC = TOS

RLF

Rotate Left f through Carry

Syntax:

[ label ]

RLF

f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

See description below

Status Affected:

Encoding:

1101

dfff

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

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