PIC16C923-04I/CL Microchip Technology, PIC16C923-04I/CL Datasheet - Page 126

• Manufacturer Part Number: PIC16C923-04I/CL
• Description: 8-Bit CMOS Microcontroller with LCD Driver
• Manufacturer: Microchip Technology

PIC16C9XX
CLRWDT
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
DS30444E - page 126
Clear Watchdog Timer
[ label ] CLRWDT
None
00h
0
1
1
TO, PD
CLRWDT instruction resets the Watch-
dog Timer. It also resets the prescaler
of the WDT. Status bits TO and PD are
set.
1
1
Before Instruction
After Instruction
Decode
CLRWDT
Q1
00
TO
WDT prescaler,
PD
WDT
WDT counter =
WDT counter =
WDT prescaler=
TO
PD
Operation
0000
Q2
No-
Process
0110
data
Q3
=
=
?
0x00
0
1
1
Counter
0100
Clear
WDT
Q4
COMF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
DECF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
Complement f
[ label ] COMF
0
d
(f)
Z
The contents of register 'f' are comple-
mented. If 'd' is 0 the result is stored in
W. If 'd' is 1 the result is stored back in
register 'f'.
1
1
Before Instruction
After Instruction
Decrement f
[ label ] DECF f,d
0
d
(f) - 1
Z
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'
1
1
Before Instruction
After Instruction
COMF
DECF
Decode
Decode
Q1
Q1
00
00
f
f
[0,1]
[0,1]
(destination)
1997 Microchip Technology Inc.
127
127
(destination)
REG1
REG1
W
CNT
Z
CNT
Z
register
register
1001
0011
CNT, 1
Read
Read
Q2
Q2
'f'
'f'
REG1,0
=
=
=
=
=
=
=
f,d
dfff
Process
dfff
Process
data
data
Q3
Q3
0x13
0x13
0xEC
0x01
0
0x00
1
destination
destination
ffff
ffff
Write to
Write to
Q4
Q4
.