Rainbow Electronics AT90S1200 - Manual (Page 35)

35
AT90S1200
0838H–AVR–03/02
Note: n: 6…0, pin number.
Alternate Functions for Port D The alternate functions of Port D are:
• T0 – Port D, Bit 4
T0, Timer/Counter0 clock source. See the timer description for further details.
• INT0 – Port D, Bit 2
INT0, External Interrupt source 0. See the interrupt description for further details.
Port D Schematics Note that all port pins are synchronized. The synchronization latches are, however, not
shown in the figures.
Figure 27. Port D Schematic Diagram (Pins PD0, PD1, PD3, PD5, and PD6)
Table 11. DDDn Bits’ Effect on Port D Pins
DDDn PORTDn I/O Pull-up Comment
0 0 Input No Tri-state (High-Z)
0 1 Input Yes PDn will source current if ext. pulled low.
1 0 Output No Push-pull Zero Output
1 1 Output No Push-pull One Output