ATMEGA161-8PI Atmel, ATMEGA161-8PI Datasheet - Page 26

• Manufacturer Part Number: ATMEGA161-8PI
• Description: IC AVR MCU 16K 8MHZ IND 40-DIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA161-8PI

• 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: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: ATMEGA1618PI

26
ATmega161(L)
Table 3. Reset Characteristics (V
Note:
‘
Table 4. Reset Delay Selections
Notes:
Table 5. Number of Watchdog Oscillator Cycles
The frequency of the Watchdog Oscillator is voltage-dependent as shown in the Electri-
cal Characteristics section. The device is shipped with CKSEL = 010.
Symbol
V
V
CKSEL
[2:0]
000
001
010
011
100
101
110
111
SUT
Unprogrammed
Unprogrammed
Programmed
Programmed
POT
RST
1. The Power-on Reset will not work unless the supply voltage has been below V
1. The CKSEL fuses control only the start-up time. The Oscillator is the same for all
2. External Power-on Reset.
3. Table 4 shows the Start-up Times from Reset. From sleep, only the clock counting
Start-up Time, V
SUT Unprogrammed
4.2 ms + 6 CK
30 µs + 6 CK
67 ms + 16K CK
4.2 ms + 16K CK
30 µs + 16K CK
67 ms + 1K CK
4.2 ms + 1K CK
30 µs + 1K CK
(falling).
selections. On Power-up, the real-time part of the start-up time is increased with typ.
0.6 ms.
part of the start-up time is used. The Watchdog Oscillator is used for timing the real-
time part of the start-up time. The number WDT Oscillator cycles used for each time-
out is shown in Table 5.
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
RESET Pin Threshold Voltage
Time-out
4.2 ms (at V
67 ms (at V
5.8 ms (at V
92 ms (at V
CC
= 2.7V,
(3)
CC
CC
CC
= 5.0V)
CC
CC
= 2.7V)
= 4.0V)
= 2.7V)
= 4.0V)
Start-up Time, V
SUT Programmed
5.8 ms + 6 CK
10 µs + 6 CK
92 ms + 16K CK
5.8 ms + 16K CK
10 µs + 16K CK
92 ms + 1K CK
5.8 ms + 1K CK
10 µs + 1K CK
(1)
(1)
CC
Min
1.0
0.4
= 4.0V,
Typ
1.4
0.6
Number of Cycles
Recommended
Usage
External Clock, Fast
Rising Power
External Clock
Crystal Oscillator,
Slowly Rising Power
Crystal Oscillator,
Fast Rising Power
Crystal Oscillator
Ceramic
Resonator/External
Clock, Slowly Rising
Power
Ceramic Resonator,
Fast Rising Power
Ceramic
Resonator
0.85 V
16K
64K
Max
1K
4K
1.8
0.8
1228D–AVR–02/07
(1)
CC
(2)
Units
(2)
V
V
V
(2)
POT