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C161 Datasheet(PDF) 140 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 140 Page - Infineon Technologies AG |
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140 / 400 page  &3, 3DUDOOHO 3RUWV User’s Manual 7-14 1999-08 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. During external accesses in demultiplexed bus modes PORT1 outputs the 16-bit intra- segment address as an alternate output function. During external accesses in multiplexed bus modes, when no BUSCON register selects a demultiplexed bus mode, PORT1 is not used and is available for general purpose IO. Figure 7-8 PORT1 IO and Alternate Functions When an external bus mode is enabled, the direction of the port pin and the loading of data into the port output latch are controlled by the bus controller hardware. The input of the port output latch is disconnected from the internal bus and is switched to the line labeled “Alternate Data Output” via a multiplexer. The alternate data is the 16-bit intrasegment address. While an external bus mode is enabled, the user software should not write to the port output latch, otherwise unpredictable results may occur. When the external bus modes are disabled, the contents of the direction register last written by the user becomes active. 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 P1H.7 P1H.6 P1H.5 P1H.4 P1H.3 P1H.2 P1H.1 P1H.0 P1L.7 P1L.6 P1L.5 P1L.4 P1L.3 P1L.2 P1L.1 P1L.0 PORT1 P1H P1L A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Alternate Function General Purpose Input/Output 8/16-bit Demux Bus |
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