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AT90S8535 Datasheet(PDF) 86 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 86 Page - ATMEL Corporation |
86 / 127 page ![]() 86 AT90S/LS8535 1041H–11/01 Figure 60. Port C Schematic Diagram (Pins PC7) Port D Port D is an 8-bit bi-directional I/O port with internal pull-up resistors. Three I/O memory address locations are allocated for Port D, one each for the Data Register – PORTD, $12($32), Data Direction Register – DDRD, $11($31) and the Port D Input Pins – PIND, $10($30). The Port D Input Pins address is read-only, while the Data Register and the Data Direction Register are read/write. The Port D output buffers can sink 20 mA. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. Some Port D pins have alternate functions as shown in Table 33. Table 33. Port D Pin Alternate Functions Port Pin Alternate Function PD0 RXD (UART Input line) PD1 TXD (UART Output line) PD2 INT0 (External interrupt 0 input) PD3 INT1 (External interrupt 1 input) PD4 OC1B (Timer/Counter1 output compareB match output) PD5 OC1A (Timer/Counter1 output compareA match output) PD6 ICP (Timer/Counter1 input capture pin) PD7 OC2 (Timer/Counter2 output compare match output) |
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