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PIC17LC44-08/P Datasheet(PDF) 135 Page - Microchip Technology

Part # PIC17LC44-08/P
Description  High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
PDF  240 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC17LC44-08/P Datasheet(HTML) 135 Page - Microchip Technology

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© 1996 Microchip Technology Inc.
DS30412C-page 135
PIC17C4X
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 prescaler
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
Read
register
PCLATH
Execute
NOP
Example:
SLEEP
Before Instruction
TO =?
PD =?
After Instruction
TO =1 †
PD =0
† If WDT causes wake-up, this bit is cleared
SUBLW
Subtract WREG from Literal
Syntax:
[
label ] SUBLW k
Operands:
0
≤ k ≤ 255
Operation:
k – (WREG)
→ (WREG)
Status Affected:
OV, C, DC, Z
Encoding:
1011
0010
kkkk
kkkk
Description:
WREG is subtracted from the eight bit
literal 'k'. The result is placed in
WREG.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal 'k'
Execute
Write to
WREG
Example 1:
SUBLW
0x02
Before Instruction
WREG
=
1
C=
?
After Instruction
WREG
=
1
C
=
1
; result is positive
Z=
0
Example 2:
Before Instruction
WREG
=
2
C=
?
After Instruction
WREG
=
0
C
=
1
; result is zero
Z=
1
Example 3:
Before Instruction
WREG
=
3
C=
?
After Instruction
WREG
=
FF ; (2’s complement)
C
=
0
; result is negative
Z=
1



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