PIC18F2331 Datasheet, PDF (324/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
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
Decode
No
operation
Q3
Process
Data
Q4
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:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
[ label ] SUBFWB f [,d [,a]]
0 ≤ f ≤ 255
d ∈ [0,1]
a ∈ [0,1]
(W) – (f) – (C) → dest
N, OV, C, DC, Z
0101 01da ffff ffff
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
Cycles:
1
Q Cycle Activity:
Q1
Q2
Decode
Read
register ‘f’
Q3
Process
Data
Q4
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
N
=0
; result is zero
DS39616B-page 322
Preliminary
 2003 Microchip Technology Inc.