Datasheet

PIC17C4X
DS30412C-page 118  1996 Microchip Technology Inc.
CLRWDT Clear Watchdog Timer
Syntax: [
label ] CLRWDT
Operands: None
Operation: 00h → WDT
0 → WDT postscaler,
1 → T
O
1 → PD
Status Affected: TO, PD
Encoding:
0000 0000 0000 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
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register
ALUSTA
Execute NOP
Example:
CLRWDT
Before Instruction
WDT counter = ?
After Instruction
WDT counter = 0x00
WDT Postscaler = 0
TO =1
PD =1
COMF Complement f
Syntax: [
label ] COMF f,d
Operands: 0 ≤ f ≤ 255
d ∈ [0,1]
Operation: → (dest)
Status Affected: Z
Encoding:
0001 001d ffff ffff
Description:
The contents of register 'f' are comple-
mented. If 'd' is 0 the result is stored in
WREG. If 'd' is 1 the result is stored
back in register 'f'.
Words: 1
Cycles: 1
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Execute Write
register 'f'
Example:
COMF REG1,0
Before Instruction
REG1 = 0x13
After Instruction
REG1 = 0x13
WREG = 0xEC
(f)