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C161 Datasheet(PDF) 147 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 147 Page - Infineon Technologies AG |
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147 / 400 page  &3, 3DUDOOHO 3RUWV User’s Manual 7-21 1999-08 Figure 7-12 Port 3 IO and Alternate Functions The port structure of the Port 3 pins depends on their alt. func. (see figure below). When the on-chip peripheral associated with a Port 3 pin is configured to use the alternate input function, it reads the input latch, which represents the state of the pin, via the line labeled “Alternate Data Input”. Port 3 pins with alternate input functions are: T2IN, T3IN, T4IN, T3EUD and CAPIN. When the on-chip peripheral associated with a Port 3 pin is configured to use the alternate output function, its “Alternate Data Output” line is ANDed with the port output latch line. When using these alternate functions, the user must set the direction of the port line to output (DP3.y=1) and must set the port output latch (P3.y=1). Otherwise the pin is in its high-impedance state (when configured as input) or the pin is stuck at '0' (when the port output latch is cleared). When the alternate output functions are not used, the “Alternate Data Output” line is in its inactive state, which is a high level ('1'). Port 3 pins with alternate output functions are: T3OUT, TxD0 and CLKOUT/FOUT. When the on-chip peripheral associated with a Port 3 pin is configured to use both the alternate input and output function, the descriptions above apply to the respective current operating mode. The direction must be set accordingly. Port 3 pins with alternate input/output functions are: SCL0, SDA0, MTSR, MRST, RxD0 and SCLK. Note: Enabling the CLKOUT function automatically enables the P3.15 output driver. Setting bit DP3.15=’1’ is not required. The CLKOUT function is automatically enabled in emulation mode. Pins P3.0 and P3.1 provide open drain output drivers only in order to be compatible with the I2C Bus specification. P3.15 P3.13 P3.12 P3.11 P3.10 P3.9 P3.8 P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0 Port 3 No Pin CLKOUT SCLK BHE RxD0 TxD0 MTSR MRST T2IN T3IN T4IN T3EUD T3OUT CAPIN SDA0 SCL0 FOUT WRH Alternate Function a) b) General Purpose Input/Output |
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