Rainbow Electronics AT90S8515 - Manual (Page 64)

64
AT90S8515
0841G–09/01
PORTAn has to be cleared (zero) or the pin has to be configured as an output pin. The
Port A pins are tri-stated when a reset condition becomes active, even if the clock is not
active..
Note: 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 45. Port A Schematic Diagrams (Pins PA0 - PA7)
Table 19. DDAn Effects on Port A Pins
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