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C161 Datasheet(PDF) 255 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 255 Page - Infineon Technologies AG |
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255 / 400 page  &3, 7KH +LJK6SHHG 6\QFKURQRXV 6HULDO ,QWHUIDFH User’s Manual 12-9 1999-08 A slave device will immediately output the selected first bit (MSB or LSB of the transfer data) at pin MRST, when the content of the transmit buffer is copied into the slave’s shift register. It will not wait for the next clock from the baudrate generator, as the master does. The reason for this is that, depending on the selected clock phase, the first clock edge generated by the master may be already used to clock in the first data bit. So the slave’s first data bit must already be valid at this time. Note: On the SSC always a transmission and a reception takes place at the same time, regardless whether valid data has been transmitted or received. This is different e.g. from asynchronous reception on ASC0. The initialization of the SCLK pin on the master requires some attention in order to avoid undesired clock transitions, which may disturb the other receivers. The state of the internal alternate output lines is ’1’ as long as the SSC is disabled. This alternate output signal is ANDed with the respective port line output latch. Enabling the SSC with an idle- low clock (SSCPO=’0’) will drive the alternate data output and (via the AND) the port pin SCLK immediately low. To avoid this, use the following sequence: • select the clock idle level (SSCPO=’x’) • load the port output latch with the desired clock idle level (P3.13=’x’) • switch the pin to output (DP3.13=’1’) • enable the SSC (SSCEN=’1’) • if SSCPO=’0’: enable alternate data output (P3.13=’1’) The same mechanism as for selecting a slave for transmission (separate select lines or special commands) may also be used to move the role of the master to another device in the network. In this case the previous master and the future master (previous slave) will have to toggle their operating mode (SSCMS) and the direction of their port pins (see description above). |
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