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C161 Datasheet(PDF) 133 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 133 Page - Infineon Technologies AG |
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133 / 400 page  &3, 3DUDOOHO 3RUWV User’s Manual 7-7 1999-08 7.3 Alternate Port Functions In order to provide a maximum of flexibility for different applications and their specific IO requirements, port lines have programmable alternate input or output functions associated with them. If an alternate output function of a pin is to be used, the direction of this pin must be programmed for output (DPx.y=‘1’), except for some signals that are used directly after reset and are configured automatically. Otherwise the pin remains in the high-impedance state and is not effected by the alternate output function. The respective port latch should hold a ‘1’, because its output is combined with the alternate output data. X-Peripherals (peripherals connected to the on-chip XBUS) control their associated IO pins directly via separate control lines. If an alternate input function of a pin is used, the direction of the pin must be programmed for input (DPx.y=‘0’) if an external device is driving the pin. The input direction is the default after reset. If no external device is connected to the pin, however, one can also set the direction for this pin to output. In this case, the pin reflects the state of the port output latch. Thus, the alternate input function reads the value stored in the port output latch. This can be used for testing purposes to allow a software trigger of an alternate input function by writing to the port output latch. Table 7-1 Summary of Alternate Port Functions Port Alternate Function(s) Alternate Signal(s) PORT0 Address and data lines when accessing external resources (e.g. memory) AD15 ... AD0, D15 ... D0, A15 ... A8 PORT1 Address lines when accessing external resources (e.g. memory) A15 ... A0 Port 2 Fast external interrupt inputs EX7IN ... EX0IN Port 3 System clock or programmable frequ. output Optional bus control signal Input/output functions of timers, serial interfaces CLKOUT/FOUT, BHE/WRH, RxD0, TxD0, MTSR, MRST, SCLK, T2IN, T3IN, T4IN, T3EUD, T3OUT, CAPIN, SDA0, SCL0 Port 4 Selected segment address lines in systems with more than 64 KBytes of ext. resources A22 ... A16 Port 5 Analog input channels to the A/D converter Timer control signal inputs AN3 ... AN0, T2EUD, T4EUD Port 6 Chip select output signals I 2C interface lines CS4 ... CS0, SDA1, SCL1, SDA2 |
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