PIC16F684-ISL

Manufacturer Part NumberPIC16F684-ISL
ManufacturerMicrochip Technology Inc.
PIC16F684-ISL datasheets
 


Specifications of PIC16F684-ISL

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Page 119/164

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RETFIE
Return from Interrupt
Syntax:
[ label ]
RETFIE
Operands:
None
Operation:
TOS
PC,
1
GIE
Status Affected:
None
Description:
Return from Interrupt. Stack is
POPed and Top-of-Stack (TOS) is
loaded in the PC. Interrupts are
enabled by setting Global
Interrupt Enable bit, GIE
(INTCON<7>). This is a two-cycle
instruction.
Words:
1
Cycles:
2
Example
RETFIE
After Interrupt
PC =
TOS
GIE =
1
RETLW
Return with literal in W
Syntax:
[ label ]
RETLW k
Operands:
0
k
255
Operation:
k
(W);
TOS
PC
Status Affected:
None
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:
1
Cycles:
2
Example
CALL TABLE;W contains
table
;offset value
;W now has table value
TABLE
ADDWF PC
;W = offset
RETLW k1
;Begin table
RETLW k2
;
; End of table
RETLW kn
Before Instruction
W
=
0x07
After Instruction
W
=
value of k8
 2004 Microchip Technology Inc.
RETURN
Return from Subroutine
Syntax:
[ label ]
Operands:
None
Operation:
TOS
Status Affected:
None
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.
RLF
Rotate Left f through Carry
Syntax:
[ label ]
Operands:
0
f
d
[0,1]
Operation:
See description below
Status Affected:
C
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:
1
Cycles:
1
Example
RLF
Before Instruction
After Instruction
Preliminary
PIC16F684
RETURN
PC
RLF
f,d
127
C
Register f
REG1,0
REG1
=
1110 0110
C
=
0
REG1
=
1110 0110
W
=
1100 1100
C
=
1
DS41202C-page 117