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PIC18F1220E/SSSQTP Datasheet(PDF) 228 Page - Microchip Technology

Part # PIC18F1220E/SSSQTP
Description  18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers
PDF  308 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F1220E/SSSQTP Datasheet(HTML) 228 Page - Microchip Technology

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PIC18F1220/1320
DS39605F-page 226
© 2007 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. The 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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