[求助]CCR中的MASKING BITS(S,X,I)的功能是什么啊???
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[求助]CCR中的MASKING BITS(S,X,I)的功能是什么啊???
| 请教CCR中的MASKING BITS(S,X,I)的功能是什么啊???非常感激!! |
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- 104380
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- 男
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- 517905
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HCS12系列的,还有问一下
Masks XIRQ 是什么时候用到它,刚开始学硬件部分,希望高手多多指教!!谢谢 |
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- 517905
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- 男
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- UID
- 104380
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- 517905
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就只是硬件, Condition Code Register 它里面的BIT4,BIT6,BIT7,我不知道怎么用,文档这样说的:
S - Disables STOP instruction when set.
X
- Masks XIRQ request when set.
I - Masks interrupt request from all , IRQ level sources ( both external and internal ) 没看懂,多谢斑竹关注!!! |
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- UID
- 104380
- 性别
- 男
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S：允许或禁止执行STOP指令 X：允许或禁止XIRQ中断 I：允许或禁止所有其他中断 |
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- UID
- 517905
- 性别
- 男
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- UID
- 517905
- 性别
- 男
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- UID
- 517905
- 性别
- 男
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- UID
- 104380
- 性别
- 男
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- UID
- 517905
- 性别
- 男
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