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ST5451 数据表(PDF) 13 Page - STMicroelectronics |
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ST5451 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 34 page  4- 2 - TRANSMIT FRAME After polling bit XFW or after a XPR interrupt, up to 32 bytes may be stored in XFIFO. Transmis- sion begins after that XHF command is issued by µP. ST5451 will request another data block by an XPR interrupt if the XFIFO contains less than 32 bytes. When XME is set, all remaining XFIFO bytes are transmitted, the CRC field and the closing flag are added. The HDLC controller then generates a new XPR interrupt. If the XFIFO becomes empty while XME com- mand has not been set, an abort sequence is generated, followed by interframe time fill and XDU interrupt is generated. A frame may be aborted by XRES command as well. Figure 2: Transmission of an HDCL frame ST5451 13/34 |
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