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C167CS Datasheet(PDF) 144 Page - Infineon Technologies AG |
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C167CS Datasheet(HTML) 144 Page - Infineon Technologies AG |
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144 / 517 page  C167CS Derivatives Parallel Ports User’s Manual 7-17 V2.0, 2000-07 Alternate Functions of PORT1 When a demultiplexed external bus is enabled, PORT1 is used as address bus. Note that demultiplexed bus modes use PORT1 as a 16-bit port. Otherwise all 16 port lines can be used for general purpose IO. The lower eight pins of PORT1 (P1L.7 … P1L.0) are also connected to the input multiplexer of the Analog/Digital Converter. For pins that shall be used as analog inputs it is recommended to disable the digital input stage via register P1DIDIS (see description below). This avoids undesired cross currents and switching noise while the (analog) input signal level is between VIL and VIH. These port lines accept analog signal for the extension channels (AN23 … AN16). The upper four pins of PORT1 (P1H.7 … P1H.4) also serve as capture inputs or compare outputs (CC27IO … CC24IO) for the CAPCOM2 unit. The usage of the port lines by the CAPCOM unit, its accessibility via software, and the precautions are the same as described for the Port 2 lines. As all other capture inputs, the capture input function of pins P1H.7 … P1H.4 can also be used as external interrupt inputs (sample rate 16 TCL). As a side effect, the capture input capability of these lines can also be used in the address bus mode. Hereby changes of the upper address lines could be detected and DP1L P1L Direction Ctrl. Register ESFR (F104H/82H) Reset Value: - - 00H 15 14 13 12 11 10 98765 43210 DP1 L.7 DP1 L.6 DP1 L.5 DP1 L.4 DP1 L.3 DP1 L.2 DP1 L.1 DP1 L.0 - - - - - - - - rw rw rw rw rw rw rw rw DP1H P1H Direction Ctrl. Register ESFR (F106H/83H) Reset Value: - - 00H 15 14 13 12 11 10 9876 543210 DP1 H.7 DP1 H.6 DP1 H.5 DP1 H.4 DP1 H.3 DP1 H.2 DP1 H.1 DP1 H.0 - - - - - - - - rw rw rw rw rw rw rw rw Bit Function DP1X.y Port direction register DP1H or DP1L bit y DP1X.y = 0: Port line P1X.y is an input (high-impedance) DP1X.y = 1: Port line P1X.y is an output |
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