PIC16F8X_13 Datasheet, PDF (61/128 Pages) Microchip Technology – 18-pin Flash/EEPROM 8-Bit Microcontrollers

PIC16F8X
COMF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Complement f
[ label ] COMF f,d
0  f  127
d  [0,1]
(f)  (destination)
Z
00 1001 dfff ffff
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
Q1 Q2 Q3
Q4
Decode
Read
register
'f'
Process Write to
data destination
Example
COMF
REG1,0
Before Instruction
REG1 =
After Instruction
REG1 =
W
=
0x13
0x13
0xEC
DECF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Decrement f
[label] DECF f,d
0  f  127
d  [0,1]
(f) - 1  (destination)
Z
00 0011 dfff ffff
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
Q1 Q2 Q3
Q4
Decode
Read
register
'f'
Process Write to
data destination
Example
DECF CNT, 1
Before Instruction
CNT =
Z
=
After Instruction
CNT =
Z
=
0x01
0
0x00
1
DECFSZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Decrement f, Skip if 0
[ label ] DECFSZ f,d
0  f  127
d  [0,1]
(f) - 1  (destination);
skip if result = 0
None
00 1011 dfff ffff
The contents of register 'f' are decre-
mented. 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 1, the next instruction, is
executed. If the result is 0, then a NOP is
executed instead making it a 2TCY instruc-
tion.
1
1(2)
Q1
Q2
Q3
Q4
Decode Read Process Write to
register 'f' data destination
If Skip:
(2nd Cycle)
Q1
Q2
Q3
Q4
No-Opera No-Operat No-Operati
No-Operat tion
ion
on
ion
Example
HERE
DECFSZ
GOTO
CONTINUE •
•
•
CNT, 1
LOOP
Before Instruction
PC = address HERE
After Instruction
CNT = CNT - 1
if CNT = 0,
PC = address CONTINUE
if CNT  0,
PC = address HERE+1
 1996-2013 Microchip Technology Inc.
DS30430D-page 61