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Q67101-H6789 데이터시트(PDF) 75 Page - Siemens Semiconductor Group |
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Q67101-H6789 데이터시트(HTML) 75 Page - Siemens Semiconductor Group |
75 / 272 page SAB 82532/SAF 82532 Asynchronous Serial Mode Semiconductor Group 75 07.96 6.4.4 In-band Flow Control Transparency In ASYNC modes an optional in-band flow control is provided with the XON/XOFF characters. If MODE:FLON bit = ‘1’ then the transmitter output is controlled based on recognition of the XON/XOFF characters at the receiver. A new optional function ‘Disable XON/XOFF Storage’ bit (DXS) in the RFC register is used to determine if the received in-band flow control characters (XON/XOFF) are to be stored in the RFIFO or to be removed from the incoming data stream. Setting the control bit RFC:DXS = ‘1’ (in conjunction with MODE:FLON = ‘1’) causes the XON/XOFF received characters to be discarded. Normally with RFC/DXS = ‘0’ (and on RESET condition) the received XON/XOFF characters are stored in the RFIFO along with the data. 6.4.5 Continuous Transmission (DMA mode only) If data transfer from system memory to the ESCC2 is done by DMA (DMA bit in XBCH set), the number of characters to be transmitted is usually defined via the Transmit Byte Count registers (XBCH, XBCL: bits XBC11 … XBC0). However, if the ‘Transmit Continuously’ (XC) bit in XBCH is set, the byte count value is ignored and the DMA interface of ESCC2 will continuously request for transmit data any time 32 new characters can be stored in XFIFO. Note: If the XC bit is reset during continuous transmission, the transmit byte count becomes valid again, and the ESCC2 will request the amount of DMA transfers programmed via XBC11 … XBC0. Otherwise, the continuous transmission is stopped when a data underrun condition occurs in XFIFO, i.e. the DMA controller does not transfer further data to ESCC2. In this case continuous ‘1’s (IDLE) are transmitted. |
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