Rainbow-electronics AT90S2313 Manuel d'utilisateur télécharger pdf (Page 55)

AT90S2313

0839I–AVR–06/02

Figure 43. Port B Schematic Diagram (Pin PB7)

Port D Three I/O memory address locations are allocated for the Port D: one each for the Data

Input Pins – PIND, $10($30). The Port D Input Pins address is read-only, while the Data

Port D has seven bi-directional I/O pins with internal pull-up resistors, PD6..PD0. 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 19:

When the pins are used for the alternate function, the DDRD and PORTD Registers

have to be set according to the alternate function description.

Table 19. Port D Pin Alternate Functions

Port Pin Alternate Function

PD0 RXD (Receive data input for the UART)

PD1 TXD (Transmit data output for the UART)

PD2 INT0 (External interrupt 0 input)

PD3 INT1 (External interrupt 1 input)

PD4 TO (Timer/Counter0 external input)

PD5 T1 (Timer/Counter1 external input)

PD6 ICP (Timer/Counter1Input Capture pin)

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 91 92

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Rainbow-electronics AT90S2313 Manuel d'utilisateur Page 55