ATMEGA161-8PI Atmel, ATMEGA161-8PI Datasheet - Page 27

• 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

Power-on Reset
1228D–AVR–02/07
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detec-
tion level is nominally 1.4V (rising V
the detection level. The POR circuit can be used to trigger the Start-up Reset, as well as
detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reach-
ing the Power-on Reset threshold voltage invokes a delay counter, which determines
the delay, for which the device is kept in RESET after V
the delay counter can be defined by the user through the CKSEL fuses. The eight differ-
ent selections for the delay period are presented in Table 4. The RESET signal is
activated again, without any delay, when the V
Figure 25. MCU Start-up, RESET Tied to V
Figure 26. MCU Start-up, RESET Controlled Externally
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
RESET
RESET
VCC
VCC
V
V
V
POT
POT
RST
t
TOUT
CC
). The POR is activated whenever V
V
RST
CC
CC
t
TOUT
decreases below detection level.
CC
ATmega161(L)
rise. The time-out period of
CC
is below
27