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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST75C540 数据表(PDF) 68 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 68 Page - STMicroelectronics |
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68 / 84 page  XI.6.4 - Long Frame XI - TRANSMITTING DATA IN PARALLEL MODE (continued) TRANSMITTED DATA BUFF_FRAB BUFF_SFRM BUFF_EFRM BUFF_LENG (BUFF_DATA) $7E 08 5 CRC $7E D0 D1 D2 D3 0 8 4 D0 D1 D2 D3 Figure 33 XI.6.5 - Abort Frame TRANSMITTED DATA BUFF_FRAB BUFF_SFRM BUFF_EFRM BUFF_LENG (BUFF_DATA) $7E D0 D1 D2 D3 0 $7E D5 0 ABORT D4 D0 D1 D2 D3 D5 D4 x 5 88 x 68 8 Figure 34 XI.6.6 - Abort Due to Underflow TRANSMITTED DATA BUFF_FRAB BUFF_SFRM BUFF_EFRM BUFF_LENG (BUFF_DATA) $7E D0 D1 D2 D3 0 ABORT $7E D4 D5 D0 D1 D2 D3 D4 D5 ERR_TX (1) (2) (3) 58 8 0 6 8 8 Figure 35 Where : 1. The Underflow condition appears when the ST75C530/540 needs, inside a frame, some bytes to transmit and that the corresponding buffer is empty. 2. The ERR_TX bit is cleared with a CSE 01 Command. 3. After an Underflow condition restart the initialization of the parallel mode and use the buffer number 0. ST75C530 - ST75C540 68/84 |
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