
PIC16F62X
DS40300C-page 112
Preliminary
2003 Microchip Technology Inc.
CLRW
Clear W
Syntax:
[ label ] CLRW
Operands:
None
Operation:
00h
→ (W)
1
→ Z
Status Affected:
Z
Encoding:
00
0001
0000
0011
Description:
W register is cleared. Zero bit
(Z) is set.
Words:
1
Cycles:
1
Example
CLRW
Before Instruction
W = 0x5A
After Instruction
W = 0x00
Z= 1
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