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PIC18F4520E/MLQTP bảng dữ liệu(PDF) 285 Page - Microchip Technology

tên linh kiện PIC18F4520E/MLQTP
Giải thích chi tiết về linh kiện  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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PIC18F4520E/MLQTP bảng dữ liệu(HTML) 285 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS39631A-page 283
PIC18F2420/2520/4420/4520
CLRF
Clear f
Syntax:
CLRF
f {,a}
Operands:
0
≤ f ≤ 255
a
∈ [0,1]
Operation:
000h
→ f
1
→ Z
Status Affected:
Z
Encoding:
0110
101a
ffff
ffff
Description:
Clears the contents of the specified
register.
If ‘a’ is ‘0’, the Access Bank is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
≤ 95 (5Fh). See
Section 24.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode” for details.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write
register ‘f’
Example:
CLRF
FLAG_REG, 1
Before Instruction
FLAG_REG
=
5Ah
After Instruction
FLAG_REG
=
00h
CLRWDT
Clear Watchdog Timer
Syntax:
CLRWDT
Operands:
None
Operation:
000h
→ WDT,
000h
→ WDT postscaler,
1
→ TO,
1
→ PD
Status Affected:
TO, PD
Encoding:
0000
0000
0000
0100
Description:
CLRWDT
instruction resets the
Watchdog Timer. It also resets the
postscaler of the WDT. Status bits, TO
and PD, are set.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
Process
Data
No
operation
Example:
CLRWDT
Before Instruction
WDT Counter
=
?
After Instruction
WDT Counter
=
00h
WDT Postscaler
=
0
TO
=1
PD
=1



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