PIC16C54C-04-P Datasheet, PDF (54/192 Pages) Microchip Technology – EPROM/ROM-Based 8-bit CMOS Microcontroller Series

PIC16C5X
COMF
Complement f
Syntax:
Operands:
Operation:
[ label ] COMF f,d
0  f  31
d  [0,1]
(f)  (dest)
Status Affected: Z
Encoding:
0010 01df ffff
Description:
The contents of register 'f' are
complemented. 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:
COMF REG1,0
Before Instruction
REG1 =
After Instruction
REG1 =
W
=
0x13
0x13
0xEC
DECF
Decrement f
Syntax:
Operands:
Operation:
[ label ] DECF f,d
0  f  31
d  [0,1]
(f) – 1  (dest)
Status Affected: Z
Encoding:
0000 11df 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
=
Z
=
After Instruction
CNT
=
Z
=
0x01
0
0x00
1
DECFSZ
Decrement f, Skip if 0
Syntax:
Operands:
Operation:
[ label ] DECFSZ f,d
0  f  31
d  [0,1]
(f) – 1  d; skip if result = 0
Status Affected: None
Encoding:
0010 11df ffff
Description:
The contents of register 'f' are dec-
remented. 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 0, the next instruc-
tion, which is already fetched, is
discarded and a NOP is executed
instead making it a two-cycle
instruction.
Words:
1
Cycles:
1(2)
Example:
HERE
DECFSZ
GOTO
CONTINUE •
•
•
CNT, 1
LOOP
Before Instruction
PC
=
After Instruction
CNT
=
if CNT =
PC
=
if CNT 
PC
=
address(HERE)
CNT - 1;
0,
address (CONTINUE);
0,
address (HERE+1)
DS30453E-page 54
Preliminary
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