ATMEGA161-8AI Atmel, ATMEGA161-8AI Datasheet - Page 90

• Manufacturer Part Number: ATMEGA161-8AI
• Description: IC AVR MCU 16K 8MHZ IND 44-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA161-8AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: ATMEGA1618AI

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