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Re: 如何用宏将32位常数赋给变量单元
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版主
 
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low, high, upper 是MPASM內定的 directive 指令，你只要這樣寫 MPASM 就可以看的懂了。
發表於: 2005/3/31 18:43
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如何用宏将32位常数赋给变量单元
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新會員
 
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各位好！
若我定义宏为： AA mcro val 其中val 为32位常数，我该怎么将其赋给变量？我看过一个应用例子是如下写的 movlw low(val) movwf reg1 movlw high(val) movwf reg1+1 movlw upper(val) movwf reg1+2 val1 = val >> 8 movlw upper(val1) movwf Reg1+3 这里的low high upper是以前定义过的呢？还是如果如上表示，系统自动就能区分val 的 low、 high 、upper字节?
發表於: 2005/3/29 18:20
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