ATMEGA169PA-MCUR View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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ATMEGA169PA-MCUR

8-bit Microcontroller with 16K Bytes In-System Programmable Flash

Atmel Corporation 

Figure 10-3. MCU Start-up, RESET Extended Externally

VCC

VPOT

RESET

VRST

TIME-OUT

tTOUT

ATmega169PA

10.2.2

External Reset

INTERNAL

RESET

An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the

minimum pulse width (see ”System and Reset Characteristics” on page 329) will generate a

reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.

When the applied signal reaches the Reset Threshold Voltage – VRST – on its positive edge, the

delay counter starts the MCU after the Time-out period – tTOUT – has expired.

Figure 10-4. External Reset During Operation

CC

48

8171B–AVR–03/10

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