PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 314

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX8
SLEEP
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
† If WDT causes wake-up, this bit is cleared.
DS41159B-page 312
Q Cycle Activity:
Before Instruction
After Instruction
Decode
TO =
PD =
TO =
PD =
Q1
?
?
1 †
0
operation
Enter SLEEP mode
[ label ] SLEEP
None
00h
0
1
0
TO, PD
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
SLEEP
No
Q2
0000
WDT postscaler,
TO,
PD
WDT,
0000
Process
Data
Q3
0000
Go to
sleep
Q4
0011
SUBFWB
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example 1:
Example 2:
Example 3:
Q Cycle Activity:
Before Instruction
After Instruction
Before Instruction
After Instruction
Before Instruction
After Instruction
Decode
REG
W
C
REG
W
C
Z
N
REG
W
C
REG
W
C
Z
N
REG
W
C
REG
W
C
Z
N
Q1
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
register ’f’
(W) – (f) – (C)
N, OV, C, DC, Z
Subtract f from W with borrow
[ label ] SUBFWB
0
d
a
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).
1
1
SUBFWB REG
SUBFWB
SUBFWB
Read
Q2
0101
0x03
0x02
0x01
0xFF
0x02
0x00
0x00
0x01
2
5
1
2
3
1
0
0
1
2
0
0
2
1
1
0
f
[0,1]
[0,1]
2002 Microchip Technology Inc.
; result is positive
; result is zero
255
; result is negative
01da
REG, 0, 0
REG, 1, 0
Process
Data
Q3
dest
ffff
f [,d [,a]]
destination
Write to
Q4
ffff