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PIC18F258-E/LSQTP Datasheet(PDF) 318 Page - Microchip Technology

Part # PIC18F258-E/LSQTP
Description  28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
PDF  402 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F258-E/LSQTP Datasheet(HTML) 318 Page - Microchip Technology

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PIC18FXX8
DS41159E-page 316
© 2006 Microchip Technology Inc.
SLEEP
Enter Sleep Mode
Syntax:
[
label ]
SLEEP
Operands:
None
Operation:
00h
→ WDT,
0
→ WDT postscaler,
1
→ TO,
0
→ PD
Status Affected:
TO, PD
Encoding:
0000
0000
0000
0011
Description:
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.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
Process
Data
Go to
Sleep
Example:
SLEEP
Before Instruction
TO =?
PD =?
After Instruction
TO =1 †
PD =0
† If WDT causes wake-up, this bit is cleared.
SUBFWB
Subtract f from W with Borrow
Syntax:
[
label ]
SUBFWB
f [,d [,a]]
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(W) – (f) – (C)
→ dest
Status Affected:
N, OV, C, DC, Z
Encoding:
0101
01da
ffff
ffff
Description:
Subtract register ‘f’ and Carry flag
(borrow) from W (2’s complement
method). If ‘d’ is ‘0’, the result is stored
in W. If ‘d’ is ‘1’, the result is stored in
register ‘f’ (default). If ‘a’ is ‘0’, the
Access Bank will be selected,
overriding the BSR value. If ‘a’ is ‘1’,
then the bank will be selected as per
the BSR value (default).
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write to
destination
Example 1:
SUBFWB REG
Before Instruction
REG
=
0x03
W
=
0x02
C
=
0x01
After Instruction
REG
=
0xFF
W
=
0x02
C
=
0x00
Z
=
0x00
N
=
0x01
; result is negative
Example 2:
SUBFWB
REG, 0, 0
Before Instruction
REG
=
2
W=
5
C=
1
After Instruction
REG
=
2
W=
3
C=
1
Z=
0
N
=
0
; result is positive
Example 3:
SUBFWB
REG, 1, 0
Before Instruction
REG
=
1
W=
2
C=
0
After Instruction
REG
=
0
W=
2
C=
1
Z
=
1
; result is zero
N=
0



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