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C161 Datasheet(PDF) 150 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 150 Page - Infineon Technologies AG |
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150 / 400 page  &3, 3DUDOOHO 3RUWV User’s Manual 7-24 1999-08 7.8 Port 4 If this 7-bit port is used for general purpose IO, the direction of each line can be configured via the corresponding direction register DP4. Alternate Functions of Port 4 During external bus cycles that use segmentation (i.e. an address space above 64 KByte) a number of Port 4 pins may output the segment address lines. The number of pins that is used for segment address output determines the external address space which is directly accessible. The other pins of Port 4 (if any) may be used for general purpose IO. If segment address lines are selected, the alternate function of Port 4 may be necessary to access e.g. external memory directly after reset. For this reason Port 4 will be switched to this alternate function automatically. P4 3RUW 'DWD5HJLVWHU SFR (FFC8 H/E4H) Reset Value: - - 00 H 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 - P4.6 P4.5 P4.4 P4.3 P4.2 P4.1 P4.0 - - - - - - - - - rw rw rw rw rw rw rw Bit Function P4.y Port data register P4 bit y DP4 P4 Direction Ctrl. Register SFR (FFCA H/E5H) Reset Value: - - 00 H 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 - DP4 .6 DP4 .5 DP4 .4 DP4 .3 DP4 .2 DP4 .1 DP4 .0 - - - - - - - - - rw rw rw rw rw rw rw Bit Function DP4.y Port direction register DP4 bit y DP4.y = 0: Port line P4.y is an input (high-impedance) DP4.y = 1: Port line P4.y is an output |
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