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C167CS Datasheet(PDF) 140 Page - Infineon Technologies AG |
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C167CS Datasheet(HTML) 140 Page - Infineon Technologies AG |
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140 / 517 page  C167CS Derivatives Parallel Ports User’s Manual 7-13 V2.0, 2000-07 Alternate Functions of PORT0 When an external bus is enabled, PORT0 is used as data bus or address/data bus. Note that an external 8-bit demultiplexed bus only uses P0L, while P0H is free for IO (provided that no other bus mode is enabled). PORT0 is also used to select the system startup configuration. During reset, PORT0 is configured to input, and each line is held high through an internal pullup device. Each line can now be individually pulled to a low level (see DC-level specifications in the respective Data Sheets) through an external pulldown device. A default configuration is selected when the respective PORT0 lines are at a high level. Through pulling individual lines to a low level, this default can be changed according to the needs of the applications. The internal pullup devices are designed such that an external pulldown resistors (see Data Sheet specification) can be used to apply a correct low level. These external pulldown resistors can remain connected to the PORT0 pins also during normal operation, however, care has to be taken such that they do not disturb the normal function of PORT0 (this might be the case, for example, if the external resistor is too strong). With the end of reset, the selected bus configuration will be written to the BUSCON0 register. The configuration of the high byte of PORT0 will be copied into the special register RP0H. This read-only register holds the selection for the number of chip selects DP0L P0L Direction Ctrl. Register ESFR (F100H/80H) Reset Value: - - 00H 15 14 13 12 11 10 98765 43210 DP0L .7 DP0L .6 DP0L .5 DP0L .4 DP0L .3 DP0L .2 DP0L .1 DP0L .0 - - - - - - - - rw rw rw rw rw rw rw rw DP0H P0H Direction Ctrl. Register ESFR (F102H/81H) Reset Value: - - 00H 15 14 13 12 11 10 98765 43210 DP0H .7 DP0H .6 DP0H .5 DP0H .4 DP0H .3 DP0H .2 DP0H .1 DP0H .0 - - - - - - - - rw rw rw rw rw rw rw rw Bit Function DP0X.y Port direction register DP0H or DP0L bit y DP0X.y = 0: Port line P0X.y is an input (high-impedance) DP0X.y = 1: Port line P0X.y is an output |
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