PIC18F2331_10 Datasheet, PDF (315/392 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

PIC18F2331/2431/4331/4431
RETURN
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
No
operation
Return from Subroutine
[ label ] RETURN [s]
s  [0,1]
(TOS)  PC;
if s = 1:
(WS)  W,
(STATUSS)  STATUS,
(BSRS)  BSR,
PCLATU, PCLATH are unchanged
None
0000 0000 0001 001s
Return from subroutine. The stack is
popped and the top of the stack (TOS)
is loaded into the program counter. If
‘s’= 1, the contents of the shadow
registers, WS, STATUSS and BSRS,
are loaded into their corresponding
registers, W, STATUS and BSR. If
‘s’ = 0, no update of these registers
occurs.
1
2
Q2
No
operation
No
operation
Q3
Process
Data
No
operation
Q4
POP PC
from stack
No
operation
Example:
RETURN
After Interrupt
PC = TOS
RLCF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Rotate Left f through Carry
[ label ] RLCF f [,d [,a]]
0  f  255
d  [0,1]
a  [0,1]
(f<n>)  dest<n + 1>,
(f<7>)  C,
(C)  dest<0>
C, N, Z
0011 01da ffff 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 W. If ‘d’
is ‘1’, the result is stored back in regis-
ter, ‘f’. If ‘a’ is ‘0’, the Access Bank will
be selected, overriding the BSR value.
If ‘a’ = 1, then the bank will be selected
as per the BSR value.
C
register f
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
1
1
Q2
Read
register ‘f’
Q3
Process
Data
Q4
Write to
destination
Example:
RLCF
REG, W
Before Instruction
REG = 1110 0110
C
=0
After Instruction
REG =
W
=
C
=
1110 0110
1100 1100
1
 2010 Microchip Technology Inc.
DS39616D-page 315