參數(shù)資料
型號(hào): PIC16C505-20/P
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDIP14
封裝: 0.300 INCH, PLASTIC, DIP-14
文件頁(yè)數(shù): 39/85頁(yè)
文件大?。?/td> 1205K
代理商: PIC16C505-20/P
PIC16C505
DS40192C-page 44
1999 Microchip Technology Inc.
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
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
CNT, 1
GOTO
LOOP
CONTINUE
Before Instruction
PC
=
address
(HERE)
After Instruction
CNT
=
CNT - 1;
if CNT
=
0,
PC
=
address (CONTINUE);
if CNT
0,
PC
=
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
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)
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