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AT83C5111 数据表(PDF) 20 Page - ATMEL Corporation |
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AT83C5111 数据表(HTML) 20 Page - ATMEL Corporation |
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20 / 86 page  20 AT8xC5111 4190A–8051–11/02 Figure 3. Push-pull Output Input Only Configuration The input only configuration is a pure input with neither pull-up nor pull-down. The input only configuration is shown in Figure 5. Figure 4. Input only Ports Description Ports P1, P3 and P4 Every output on the AT8xC5111 may potentially be used as a 20 mA sink LED drive out- put. However, there is a maximum total output current for all ports which must not be exceeded. All port pins of the AT8xC5111 have slew rate controlled outputs. This is to limit noise generated by quickly switching output signals. The slew rate is factory set to approximately 10 ns rise and fall times. The inputs of each I/O port of the AT8xC5111 are TTL level Schmitt triggers with hysteresis. Ports P0 and P2 The high pin-count version of the AT8xC5111 has standard address and data ports P0 and P2. These ports are standard C51 ports (Quasi bi-directional I/O). The control lines are provided on the pins: ALE, PSEN, EA, Reset; RD and WR signals are on the bits P1.1 and P1.0 . Input Pin Strong N P Port latch Data Data Input Pin Data |
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