Rainbow-electronics ATmega161L Manuale Utente Scaricare il pdf (Pagina 90)

ATmega161(L)

1228C–AVR–08/02

Port A pins are tri-stated when a reset condition becomes active, even if the clock is not

running.

Note: 1. n: 7,6…0, pin number

Port A Schematics Note that all port pins are synchronized. The synchronization latch is, however, not

shown in the figure.

Figure 55. Port A Schematic Diagrams (Pins PA0 - PA7)

Table 29. DDAn Effects on Port A Pins

(1)

DDAn PORTAn I/O Pull-up Comment

0 0 Input No Tri-state (high-Z)

0 1 Input Yes PAn will source current if ext. pulled low.

1 0 Output No Push-pull Zero Output

1 1 Output No Push-pull One Output

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 158 159

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Rainbow-electronics ATmega161L Manuale Utente Pagina 90