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C511 Datasheet(PDF) 40 Page - Siemens Semiconductor Group |
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C511 Datasheet(HTML) 40 Page - Siemens Semiconductor Group |
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40 / 128 page  On-Chip Peripheral Units Semiconductor Group 6-7 Port 0, in contrast to ports 1, 2 and 3, is considered as "true" bidirectional, because the port 0 pins float when configured as inputs. Thus, this port differs in not having internal pullups. The pullup FET in the P0 output driver (see figure 6-16a) is used only when the port is emitting 1 s during the external memory accesses. Otherwise, the pullup is always off. Consequently, P0 lines that are used as output port lines are open drain lines. Writing a "1" to the port latch leaves both output FETs off and the pin floats. In that condition it can be used as high-impedance input. If port 0 is configured as general I/O port and has to emit logic high-level (1), external pullups are required. Figure 6-16a Port 0 Circuitry |
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