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SAB82532H Datasheet(PDF) 78 Page - Siemens Semiconductor Group |
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SAB82532H Datasheet(HTML) 78 Page - Siemens Semiconductor Group |
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78 / 272 page  SAB 82532/SAF 82532 Character Oriented Serial Mode (MONOSYNC/BISYNC) Semiconductor Group 78 07.96 7.3 Data Transmission Transmission of data written to XFIFO is initiated after the Transmit Frame command (XF) is issued (the LSB is sent out first). Additionally, the CTS signal may be used to control data transmission. Further data is requested by interrupt (XPR) or DMA. The message frame is assembled by appending all data characters to the specified SYN character(s) until Transmit Message End is detected (XME command in interrupt mode, or, in DMA mode, when the number of characters specified in XBCH, XBCL have been transferred). Internally generated parity information may be added to each character (SYN, CRC and Preamble characters are excluded). If enabled via CRC Append bit (CAPP), the internally calculated CRC checksum (16 bit) is added to the message frame. Selection between CRC-16 and CRC-CCITT algorithms is provided. For all characters which have to be included into CRC calculation, the CON flag has to be set to ‘1’. This flag which controls the CRC generator is FIFOed together with each character. There is no need to modify CON for every character loaded if continuous characters are to be either included into or excluded from CRC calculation. Note: - Internally generated SYN characters are always excluded from CRC calculation, - CRC checksum (2 bytes) is sent without parity. The internal CRC generator is automatically initialized before transmission of a new frame starts. The initialization value is selectable. After finishing data transmission, Interframe Timefill (SYN characters or IDLE) is automatically sent. |
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