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參數(shù)資料
| 型號： | SX20AC100SO |
| 元件分類： | 8位微控制器 |
| 英文描述： | IC-SM-8-BIT MCU |
| 中文描述： | 集成電路釤8位微控制器 |
| 文件頁數(shù)： | 34/42頁 |
| 文件大?。?/td> | 312K |
| 代理商： | SX20AC100SO |
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1999 Scenix Semiconductor, Inc. All rights reserved.
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SX18AC / SX20AC / SX28AC
16.1
Some assemblers support additional instruction mne-
monics that are special cases of existing instructions or
alternative mnemonics for standard ones. For example,
an assembler might support the mnemonic “CLC” (clear
Equivalent Assembler Mnemonics
carry), which is interpreted the same as the instruction
“clrb $03.0” (clear bit 0 in the STATUS register). Some of
the commonly supported equivalent assembler mnemon-
ics are described in Table 16-2.
Table 16-2. Equivalent Assembler Mnemonics
Syntax
Description
Equivalent
Cycles
CLC
Clear Carry bit
CLRB $03.0
1
CLZ
Clear Zero bit
CLRB $03.2
1
JMP W
Jump Indirect W
MOV $02,W
4 or 3 (note 1)
JMP PC+W
Jump Indirect W Relative
ADD $02,W
4 or 3 (note 1)
MODE imm4
Move Immediate to MODE
Register
MOV M,#lit
1
NOT W
Complement W
XOR W,#$FF
1
SC
Skip if Carry bit Set
SB $03.0
1 or 2 (note 2)
SKIP
Skip Next Instruction
SNB $02.0 or SB $02.0
4 or 2 (note 3)
Note 1: The JMP W or JMP PC+W instruction takes 4 cycles in the “compatible” clocking mode or 3 cycles in the
“turbo” clocking mode.
Note 2: The SC instruction takes 1 cycle if the tested condition is false or 2 cycles if the tested condition is true.
Note 3: The assembler converts the SKIP instruction into a SNB or SB instruction that tests the least significant bit
of the program counter, choosing SNB or SB so that the tested condition is always true. The instruction takes 4 cycles
in the “compatible” clocking mode or 2 cycles in the “turbo” clocking mode.
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