参数资料
型号: PIC16LC556-04/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, SSOP-20
文件页数: 55/104页
文件大小: 697K
代理商: PIC16LC556-04/SS
PIC16C55X
DS40143A-page 54
Preliminary
1996 Microchip Technology Inc.
CLRWDT
Clear Watchdog Timer
Syntax:
[
label ] CLRWDT
Operands:
None
Operation:
00h
→ WDT
0
→ WDT prescaler,
1
→ TO
1
→ PD
Status Affected:
TO, PD
Encoding:
00
0000
0110
0100
Description:
CLRWDT
instruction resets the
Watchdog Timer. It also resets the
prescaler of the WDT. Status bits TO
and PD are set.
Words:
1
Cycles:
1
Example
CLRWDT
Before Instruction
WDT counter =
?
After Instruction
WDT counter =
0x00
WDT prescaler =
0
TO
=1
PD
=1
COMF
Complement f
Syntax:
[
label ] COMF
f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f)
→ (dest)
Status Affected:
Z
Encoding:
00
1001
dfff
ffff
Description:
The contents of register 'f' are
complemented. If 'd' is 0 the result is
stored in W. If 'd' is 1 the result is
stored back in register 'f'.
Words:
1
Cycles:
1
Example
COMF
REG1,0
Before Instruction
REG1
=
0x13
After Instruction
REG1
=
0x13
W
=
0xEC
DECF
Decrement f
Syntax:
[
label ] DECF f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f) - 1
→ (dest)
Status Affected:
Z
Encoding:
00
0011
dfff
ffff
Description:
Decrement register 'f'. If 'd' is 0 the
result is stored in the W register. If 'd'
is 1 the result is stored back in register
'f'
.
Words:
1
Cycles:
1
Example
DECF
CNT,
1
Before Instruction
CNT
=
0x01
Z=
0
After Instruction
CNT
=
0x00
Z=
1
DECFSZ
Decrement f, Skip if 0
Syntax:
[
label ] DECFSZ f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f) - 1
→ (dest);
skip if result = 0
Status Affected:
None
Encoding:
00
1011
dfff
ffff
Description:
The contents of register 'f' are
decremented. If 'd' is 0 the result is
placed in the W register. If 'd' is 1 the
result is placed back in register 'f'.
If the result is 0, the next instruction,
which is already fetched, is discarded. A
NOP is executed instead making it a
two-cycle instruction.
Words:
1
Cycles:
1(2)
Example
HERE
DECFSZ
CNT, 1
GOTO
LOOP
CONTINUE
Before Instruction
PC
=
address HERE
After Instruction
CNT
=
CNT - 1
if CNT =
0,
PC
=
address CONTINUE
if CNT
0,
PC
=
address HERE+1
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