PIC16C5X
OPTION
Syntax:
Load OPTION Register
[ label ] OPTION
None
RLF
Rotate Left f through Carry
Syntax:
Operands:
[ label ] RLF f,d
Operands:
Operation:
0 ≤ f ≤ 31
d
[0,1]
(W) → OPTION
Status Affected: None
Operation:
See description below
C
0000
0000
0010
Encoding:
Status Affected:
Encoding:
The content of the W register is loaded
into the OPTION register.
Description:
0011
01df
ffff
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'.
Description:
Words:
Cycles:
Example
1
1
OPTION
Before Instruction
register 'f'
C
W
=
0x07
0x07
After Instruction
OPTION
Words:
1
=
Cycles:
Example:
1
RLF
REG1,0
RETLW
Return with Literal in W
Before Instruction
Syntax:
[ label ] RETLW
k
REG1
C
=
=
1110 0110
0
Operands:
Operation:
0 ≤ k ≤ 255
After Instruction
k → (W);
TOS → PC
REG1
W
C
=
=
=
1110 0110
1100 1100
1
Status Affected: None
1000
kkkk
kkkk
Encoding:
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.
Description:
RRF
Rotate Right f through Carry
[ label ] RRF f,d
0 ≤ f ≤ 31
Syntax:
Operands:
d
[0,1]
Words:
1
2
Operation:
See description below
C
Cycles:
Example:
Status Affected:
Encoding:
CALL TABLE ;W contains
;table offset
;value.
0011
00df
ffff
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'.
Description:
•
•
;W now has table
;value.
•
TABLE
ADDWF PC
RETLW k1
RETLW k2
;W = offset
;Begin table
;
register 'f'
C
•
•
Words:
1
•
Cycles:
Example:
1
RETLW kn
; End of table
RRF
REG1,0
Before Instruction
W
=
0x07
Before Instruction
REG1
C
=
=
1110 0110
0
After Instruction
value of k8
W
=
After Instruction
REG1
W
C
=
=
=
1110 0110
0111 0011
0
1998 Microchip Technology Inc.
Preliminary
DS30453B-page 51
MICROCHIP [ MICROCHIP ]
