PIC17C44-08SLASHP datasheet(131/240 Pages) MICROCHIP

131 / 240 page

DS30412C-page 131

PIC17C4X

RETFIE

Return from Interrupt

Syntax:

[

label ]

RETFIE

Operands:

None

Operation:

TOS

→ (PC);

→ GLINTD;

PCLATH is unchanged.

Status Affected:

GLINTD

Encoding:

0000

0101

Description:

Return from Interrupt. Stack is POP’ed

and Top of Stack (TOS) is loaded in the

PC. Interrupts are enabled by clearing

the GLINTD bit. GLINTD is the global

interrupt disable bit (CPUSTA<4>).

Words:

Cycles:

Q Cycle Activity:

Decode

Read

T0STA

Execute

NOP

Forced NOP

NOP

Execute

NOP

Example:

RETFIE

After Interrupt

TOS

GLINTD =

RETLW

Return Literal to WREG

Syntax:

[

label ]

RETLW k

Operands:

≤ k ≤ 255

Operation:

→ (WREG); TOS → (PC);

PCLATH is unchanged

Status Affected:

None

Encoding:

1011

0110

kkkk

Description:

WREG is loaded with the eight bit literal

'k'. The program counter is loaded from

the top of the stack (the return address).

The high address latch (PCLATH)

remains unchanged.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

literal 'k'

Execute

Write to

WREG

Forced NOP

NOP

Execute

NOP

Example:

CALL TABLE ; WREG contains table

;

offset value

;

WREG now has

;

table value

TABLE

ADDWF PC

; WREG = offset

RETLW k0

; Begin table

RETLW k1

;

RETLW kn

; End of table

Before Instruction

WREG

0x07

After Instruction

WREG

value of k7

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