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数据搜索系统，热门电子元器件搜索 |
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ST20C2 数据表(PDF) 19 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 19 Page - STMicroelectronics |
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19 / 212 page  19/212 ® The length of the object that stores a signed integer can be increased (i.e. the object size can be increased). This operation is known as ‘sign extension’. The extra bits that are allocated for the larger object, are meaningful to the value of the signed integer. They must therefore be set to the appropriate value. The value for all these extra bits is in fact the same as the value of the most significant bit - i.e. the sign bit - of the smaller object. The ST20 provides instructions that sign extend byte and half-word to word, and 32 bits to 64 bits. |
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