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C161 Datasheet(PDF) 258 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 258 Page - Infineon Technologies AG |
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258 / 400 page  &3, 7KH +LJK6SHHG 6\QFKURQRXV 6HULDO ,QWHUIDFH User’s Manual 12-12 1999-08 12.4 Port Control The SSC uses three pins of Port 3 to communicate with the external world. Pin P3.13/ SCLK serves as the clock line, while pins P3.8/MRST (Master Receive / Slave Transmit) and P3.9/MTSR (Master Transmit / Slave Receive) serve as the serial data input/output lines.The operation of these pins depends on the selected operating mode (master or slave). In order to enable the alternate output functions of these pins instead of the general purpose IO operation, the respective port latches have to be set to ’1’, since the port latch outputs and the alternate output lines are ANDed. When an alternate data output line is not used (function disabled), it is held at a high level, allowing IO operations via the port latch. The direction of the port lines depends on the operating mode. The SSC will automatically use the correct alternate input or output line of the ports when switching modes. The direction of the pins, however, must be programmed by the user, as shown in the tables. Using the open drain output feature helps to avoid bus contention problems and reduces the need for hardwired hand-shaking or slave select lines. In this case it is not always necessary to switch the direction of a port pin. The table below summarizes the required values for the different modes and pins. Note: In the table above, an ’x’ means that the actual value is irrelevant in the respective mode, however, it is recommended to set these bits to ’1’, so they are already in the correct state when switching between master and slave mode. SSC Port Control Pin Master Mode Slave Mode Function Port Latch Direction Function Port Latch Direction SCLK Serial Clock Output P3.13 = ’1’ DP3.13=’ 1’ Serial Clock Input P3.13 = ’x’ DP3.13=’ 0’ MTSR Serial Data Output P3.9 = ’1’ DP3.9 = ’1’ Serial Data Input P3.9 = ’x’ DP3.9 = ’0’ MRST Serial Data Input P3.8 = ’x’ DP3.8 = ’0’ Serial Data Output P3.8 = ’1’ DP3.8 = ’1’ |
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