ATMEGA325P_06 datasheet(47/336 Pages) ATMEL

Part #	ATMEGA325P

Description	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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47

8023A–AVR–12/06

ATmega325P/3250P

Figure 9-1.

Reset Logic

9.2.1

Power-on Reset

A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level

is defined in ”System and Reset Characterizations” on page 309. The POR is activated when-

ever V

CC is below the detection level. The POR circuit can be used to trigger the start-up Reset,

as well as to detect a failure in supply voltage.

A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the

Power-on Reset threshold voltage invokes the delay counter, which determines how long the

device is kept in RESET after V

CC rise. The RESET signal is activated again, without any delay,

when V

CC decreases below the detection level.

Figure 9-2.

MCU Start-up, RESET Tied to V

CC

MCU Status

Register (MCUSR)

Brown-out

Reset Circuit

BODLEVEL [1..0]

Delay Counters

CKSEL[3:0]

CK

TIMEOUT

DATA BUS

Clock

Generator

SPIKE

FILTER

Pull-up Resistor

JTAG Reset

Register

Watchdog

Oscillator

SUT[1:0]

Power-on Reset

Circuit

V

RESET

TIME-OUT

INTERNAL

RESET

t

TOUT

V

POT

V

RST

CC

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