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PIC18F25K20T-ISS Datasheet, PDF (350/456 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology | |||
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PIC18F2XK20/4XK20
SLEEP
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Enter Sleep mode
SLEEP
None
00h ï® WDT,
0 ï® WDT postscaler,
1 ï® TO,
0 ï® PD
TO, PD
0000 0000 0000 0011
The Power-down Status bit (PD) is
cleared. The Time-out Status bit (TO)
is set. Watchdog Timer and its
postscaler are cleared.
The processor is put into Sleep mode
with the oscillator stopped.
1
1
Q2
No
operation
Q3
Process
Data
Q4
Go to
Sleep
Example:
SLEEP
Before Instruction
TO = ?
PD = ?
After Instruction
TO = 1 â
PD = 0
â If WDT causes wake-up, this bit is cleared.
SUBFWB
Subtract f from W with borrow
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
SUBFWB f {,d {,a}}
0 ï£ï f ï£ï 255
d ï [0,1]
a ï [0,1]
(W) â (f) â (C) ï®ï dest
N, OV, C, DC, Z
0101 01da ffff ffff
Subtract register âfâ and CARRY flag
(borrow) from W (2âs complement
method). If âdâ is â0â, the result is stored
in W. If âdâ is â1â, the result is stored in
register âfâ (default).
If âaâ is â0â, the Access Bank is
selected. If âaâ is â1â, the BSR is used
to select the GPR bank.
If âaâ is â0â and the extended instruction
set is enabled, this instruction
operates in Indexed Literal Offset
Addressing mode whenever
f ï£ï 95 (5Fh). See Section 24.2.3
âByte-Oriented and Bit-Oriented
Instructions in Indexed Literal Offset
Modeâ for details.
1
1
Q2
Read
register âfâ
Q3
Process
Data
Q4
Write to
destination
Example 1:
SUBFWB REG, 1, 0
Before Instruction
REG = 3
W
=2
C
=1
After Instruction
REG =
W
=
C
=
Z
=
N
=
FF
2
0
0
1 ; result is negative
Example 2:
SUBFWB REG, 0, 0
Before Instruction
REG = 2
W
=5
C
=1
After Instruction
REG =
W
=
C
=
Z
=
N
=
2
3
1
0
0 ; result is positive
Example 3:
SUBFWB REG, 1, 0
Before Instruction
REG = 1
W
=2
C
=0
After Instruction
REG =
W
=
C
=
Z
=
N
=
0
2
1
1 ; result is zero
0
DS41303G-page 350
ï£ 2010 Microchip Technology Inc.
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