Datasheet

PIC16C55X
DS40143E-page 58 Preliminary  1996-2013 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