參數(shù)資料
型號(hào)： HCS100
廠商： Microchip Technology Inc.
英文描述： Bi-directional Authenticator(雙向文電鑒別碼)
中文描述： 雙向認(rèn)證者（雙向文電鑒別碼）
文件頁數(shù)： 115/170頁
文件大?。?/td> 4191K
代理商： HCS100
2003 Microchip Technology Inc.
Preliminary
DS40300C-page 113
PIC16F62X
DECFSZ
Decrement f, Skip if 0
Syntax:
[
label
] DECFSZ f,d
Operands:
0
≤
f
≤
127
d
∈
[0,1]
Operation:
(f) - 1
→
(dest); skip if result =
0
Status Affected:
None
Encoding:
00
1011
dfff
ffff
Description:
The contents of register 'f' are
decremented. 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
instruction, which is already
fetched, is discarded. A
NOP
is
executed instead making it a
two-cycle instruction.
Words:
1
Cycles:
1(2)
Example
HERE DECFSZ REG1, 1
GOTO LOOP
CONTINUE
Before Instruction
PC
After Instruction
REG1
if REG1 = 0,
PC
if REG1
≠
0,
PC
=
address
HERE
= REG1 - 1
= address
CONTINUE
= address
HERE+1
GOTO
Unconditional Branch
Syntax:
[
label
] GOTO k
Operands:
0
≤
k
≤
2047
Operation:
k
→
PC<10:0>
PCLATH<4:3>
→
PC<12:11>
Status Affected:
None
Encoding:
10
1kkk
kkkk
kkkk
Description:
GOTO
is an unconditional
branch. The eleven bit
immediate value is loaded into
PC bits <10:0>. The upper bits
of PC are loaded from
PCLATH<4:3>.
GOTO
is a two-
cycle instruction.
Words:
1
Cycles:
2
Example
GOTO THERE
After Instruction
PC = Address
THERE
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