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C161 Datasheet(PDF) 244 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 244 Page - Infineon Technologies AG |
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244 / 400 page  &3, 7KH $V\QFKURQRXV6\QFKURQRXV 6HULDO ,QWHUIDFH User’s Manual 11-16 1999-08 Note: Please refer to the general Interrupt Control Register description for an explanation of the control fields. Using the ASC0 Interrupts For normal operation (i.e. besides the error interrupt) the ASC0 provides three interrupt requests to control data exchange via this serial channel: • S0TBIR is activated when data is moved from S0TBUF to the transmit shift register. • S0TIR is activated before the last bit of an asynchronous frame is transmitted, or after the last bit of a synchronous frame has been transmitted. • S0RIR is activated when the received frame is moved to S0RBUF. While the task of the receive interrupt handler is quite clear, the transmitter is serviced by two interrupt handlers. This provides advantages for the servicing software. For single transfers is is sufficient to use the transmitter interrupt (S0TIR), which indicates that the previously loaded data has been transmitted, except for the last bit of an asynchronous frame. For multiple back-to-back transfers it is necessary to load the following piece of data at last until the time the last bit of the previous frame has been transmitted. In asynchronous mode this leaves just one bit-time for the handler to respond to the transmitter interrupt request, in synchronous mode it is impossible at all. Using the transmit buffer interrupt (S0TBIR) to reload transmit data gives the time to transmit a complete frame for the service routine, as S0TBUF may be reloaded while the previous data is still being transmitted. S0EIC ASC0 Error Intr. Ctrl. Reg. SFR (FF70 H/B8H) Reset value: - - 00 H 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 - S0 EIR S0 EIE ILVL GLVL -- -- --- - rwh rw rw rw |
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