atmega161-4pi ATMEL Corporation, atmega161-4pi Datasheet - Page 90

• Manufacturer Part Number: atmega161-4pi
• Description: 8-bit Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Port A Schematics
90
ATmega161(L)
Port A pins are tri-stated when a reset condition becomes active, even if the clock is not
running.
Table 29. DDAn Effects on Port A Pins
Note:
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)
DDAn
0
0
1
1
1. n: 7,6…0, pin number
PORTAn
0
1
0
1
Output
Output
Input
Input
I/O
Pull-up
Yes
No
No
No
(1)
Comment
Tri-state (high-Z)
PAn will source current if ext. pulled low.
Push-pull Zero Output
Push-pull One Output
1228D–AVR–02/07