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DM163006 Datasheet(PDF) 247 Page - Microchip Technology

Part # DM163006
Description  High-Performance ROM-less Microcontrollers
PDF  320 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DM163006 Datasheet(HTML) 247 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Advance Information
DS39541A-page 247
PIC18C601/801
RETURN
Return from Subroutine
Syntax:
[ label ]
RETURN [s]
Operands:
s
∈ [0,1]
Operation:
(TOS)
→ PC,
if s = 1
(WS)
→ W,
(STATUSS)
→ STATUS,
(BSRS)
→ BSR,
PCLATU, PCLATH are unchanged
Status Affected:
None
Encoding:
0000
0000
0001
001s
Description:
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, STA-
TUSS and BSRS are loaded into
their corresponding registers,
WREG, STATUS and BSR. If
’s’ = 0, no update of these
registers occurs (default).
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
Process
Data
Pop PC
from stack
No
operation
No
operation
No
operation
No
operation
Example:
RETURN
After Call
PC
=
TOS
RETURN FAST
Before Instruction
WRG
=
04h
STATUS =
00h
BSR
=
00h
After Instruction
WREG
=
04h
STATUS =
00h
BSR
=
00h
PC
=
TOS
RLCF
Rotate Left f through Carry
Syntax:
[ label ] RLCF
f [,d [,a]]
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(f<n>)
→ dest<n+1>,
(f<7>)
→ C,
(C)
→ dest<0>
Status Affected:
C,N,Z
Encoding:
0011
01da
ffff
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 WREG. If 'd' is 1 the result
is stored back in register 'f' (default).
If ’a’ is 0, the Access Bank will be
selected, overriding the BSR value.
If ’a’ is 1, the Bank will be selected
as per the BSR value.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ’f’
Process
Data
Write to
destination
Example:
RLCF
REG, W
Before Instruction
REG
=
1110 0110
C=
0
N=
?
Z=
?
After Instruction
REG
=
1110 0110
WREG
=
1100 1100
C=
1
N=
1
Z=
0
C
register f



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