PIC16LC505-04 View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'PIC16LC505-04' PDF : 85 Pages View PDF
PIC16C505
COMF
Complement f
Syntax:
[ label ] COMF f,d
Operands:
0 ≤ f ≤ 31
d ∈ [0,1]
Operation:
(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 regis-
ter ’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 ≤ 31
d ∈ [0,1]
Operation:
(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 = 0x01
Z
=0
After Instruction
CNT = 0x00
Z
=1
DS40192C-page 44
DECFSZ
Decrement f, Skip if 0
Syntax:
[ label ] DECFSZ f,d
Operands:
0 ≤ f ≤ 31
d ∈ [0,1]
Operation:
(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
= address (HERE)
After Instruction
CNT =
if CNT =
PC
=
if CNT ≠
PC
=
CNT - 1;
0,
address (CONTINUE);
0,
address (HERE+1)
GOTO
Unconditional Branch
Syntax:
[ label ] GOTO k
Operands:
0 ≤ k ≤ 511
Operation:
k → PC<8:0>;
STATUS<6:5> → PC<10:9>
Status Affected: None
Encoding:
101k kkkk kkkk
Description:
GOTO is an unconditional branch.
The 9-bit immediate value is
loaded into PC bits <8:0>. The
upper bits of PC are loaded from
STATUS<6:5>. GOTO is a two cycle
instruction.
Words:
1
Cycles:
2
Example:
GOTO THERE
After Instruction
PC = address (THERE)
© 1999 Microchip Technology Inc.
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